FM Transmitter


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Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet. This transmitter should not be used as a room or telephone bug.

Schematic

This is the schematic of the FM Transmitter

PC Board Layout and Parts Placement

This is the printed circuit layout and parts placement of the FM Transmitter

Parts

Part
Total Qty.
Description
Substitutions
C110.001uf Disc Capacitor
C215.6pf Disc Capacitor
C3,C4210uf Electrolytic Capacitor
C513-18pf Adjustable Cap
R11270 Ohm 1/8W Resistor270 Ohm 1/4W Resistor
R2,R5,R634.7k 1/8W Resistor4.7K 1/4W Resistor
R3110k 1/8W Resistor10K 1/4W Resistor
R41100k 1/8W Resistor100K 1/4W Resistor
Q1, Q222N2222A NPN Transistor2N3904, NTE123A
L1, L225 Turn Air Core Coil
MIC1Electret Microphone
MISC19V Battery Snap, PC Board, Wire For Antenna

Notes

  1. L1 and L2 are 5 turns of 28 AWG enamel coated magnet wire wound with a inside diameter of about 4mm. The inside of a ballpoint pen works well (the plastic tube that holds the ink). Remove the form after winding then install the coil on the circuit board, being careful not to bend it.
  2. C5 is used for tuning. This transmitter operates on the normal broadcast frequencies (88-108MHz).
  3. Q1 and Q2 can also be 2N3904 or something similar.
  4. You can use 1/4 W resistors mounted vertically instead of 1/8 W resistors.
  5. You may want to bypass the battery with a .01uf capacitor.
  6. An antenna may not be required for operation.
  7. A thanks goes out to Mike_Springer@iname.com for cleaning up the original image once displayed on the page. It looks a lot better now!

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Comments

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Ashok
FM Transmitter
Monday, June 30, 2014 12:48:38 AM
Hi! I'd like to use the transmitter for remote switching.How to replace mic to send a switching pulse? I'm a teacher in the high school & I'd like very much to put forward this project for the annual competition for my students. Thank you Sir! Ashok.
Tanyut
Reciever
Sunday, June 22, 2014 1:57:51 AM
Can you please tell me how to make a reciever of the same frequency as this tranmitter.
Gabberworld
FM Transmitter
Friday, April 11, 2014 3:58:42 PM
KN2222A looks like the 2N3904, soo i think that yes you can use that
anonymous
FM Transmitter
Wednesday, April 09, 2014 8:39:08 PM
this transmitter needs stable voltage, any voltage trop or rise changes the frequency
jadexs
FM Transmitter
Sunday, September 01, 2013 12:59:20 AM
please help me about this circuit,can i replace mic by audio jack ?????
Thinkker
FM Transmitter
Saturday, July 13, 2013 10:16:02 AM
I builded that transmitter to that PCB layout seen on that page. That little transmitter is very unstable, it drift 89.100 to 89.329, 229khz in 5mins! And FM deviation iss very slow, only about 5khz. So after that I builded smaller versio of that using junk SMD parts and with little modifications. I get it stability to 50khz/5min and deviation to allmost 100khz.
sarah
FM Transmitter
Monday, October 22, 2012 9:26:10 AM
what is BS170? is this transistor and how this fm transmiter give best result?
anonymous
FM Transmitter
Sunday, October 21, 2012 11:09:32 PM
How were the values of the FM transmitter determined?
anonymous
FM Transmitter
Saturday, September 15, 2012 6:33:50 PM
Hello friends i maid this Fm transmitter successfully . you can get the all details from this link
chano
28 awg enamel
Saturday, September 01, 2012 7:38:15 PM
where can i buy a meter of 28 awg enamel coated wire?
anonymous
FM Transmitter
Friday, June 22, 2012 7:46:56 AM
Very very good. I want to create a walkie-talkie
Gabberworld
FM Transmitter
Wednesday, June 20, 2012 4:13:16 PM
yes, audio input add to the c3, remove the r5, q2, r4, c4, r6 and mic, as they not needed then
jorge sales
FM Transmitter
Sunday, June 10, 2012 12:20:03 PM
Can I replace the mic with an audio jack so that I can put an audio input via mp3 player etc. to the transmitter instead? Thank you!
Jitendranepali
FM Transmitter
Tuesday, May 29, 2012 6:24:33 AM
Can I use KN2222A transistor instead of 2N2222A . Tell me fast...waiting
Gabberworld
FM Transmitter
Thursday, May 10, 2012 11:40:33 AM
i tried transistor 2N3904 for Q1 and it works, after testing and testing the 2N3904 i found that using BS170 gives better signal results.
Rob
FM Transmitter
Thursday, May 03, 2012 2:41:30 PM
Why make one, when you can buy one. I purchased this one http://wholehousefmtransmitter.com and it seems to work all right. Deal with some cracking every once in awhile but it does ok.
Leinreb
FM Transmitter
Wednesday, April 11, 2012 10:18:26 AM
The frequency is determined by the Coil/Capacitor combination. If the frequency is too low, spread the coil or rewind with one less turn, do the opposite if freq is too high. It does not matter if the coil buldges up from the board if you spread it. You also can use more or less capacitance to obtain your frequency.
anonymous
FM Transmitter
Wednesday, April 04, 2012 4:32:05 PM
Found this circuit on www.radio-circuits.com only it has a better circuitboard layout and also includes a great stripboard layout plus a lot of other fm transmitter circuits with full layouts
anonymous
FM Transmitter
Wednesday, March 28, 2012 8:55:33 AM
I do alot of fox hunting, How would i make this so it will go on 146.565 and make it more stable?
Gabberworld
FM Transmitter
Saturday, February 18, 2012 1:13:15 PM
view that oscilloscope show the sine wave in antenna outbut, if not try change C2 or C5
DragonRei
FM Transmitter
Tuesday, February 14, 2012 2:23:42 PM
I built the transmitter, and the first stage is working great, but I just can't get my second stage to resonate. I've wound about 7 pairs of inductors so far and to no avail. I'm using 22 gauge madnet wire for both the inductors and the antenna, anyone have any suggestions?
Officer Dicklock
FM Transmitter
Friday, February 03, 2012 9:08:11 PM
Maybe those who can't spell do not have English as their first language.
Gabberworld
FM Transmitter
Wednesday, February 01, 2012 9:08:00 PM
Replace L2 with some adjustable coil and add bigger C5 ex: 3-60pf
Pankaj
FM Transmitter
Tuesday, January 31, 2012 9:04:05 AM
Sir I made a same transmitter but frequency is varying 97.5 to 97.8, I want to fix it, if it is possible then tell me, I will be thanks full for you.
Gabberworld
FM Transmitter
Sunday, January 29, 2012 7:43:18 AM
Add some power transistor to Q1, NTE473, 2N3375, BLY87A, 2N3632, BLY89A
anonymous
FM Transmitter
Friday, January 27, 2012 4:38:52 AM
Hallo, i need information about operating a local fm station that will cover atleast 10km of my village. So i need information about the material required especially the kind of transmitter i may use and other materials . Thanks
anonymous
FM Transmitter
Sunday, January 08, 2012 2:11:03 PM
Is there meant to be any spacing between the coils in the air coil or should i leave no space at all? I know it affects the overall frequency output....
anonymous
FM Transmitter
Tuesday, December 20, 2011 5:11:47 PM
I definitely agree with Compu, It's also annoying when people can't spell simple words like build. It's like they should go back to grade school.
anonymous
FM Transmitter
Friday, December 02, 2011 12:03:16 PM
Agree with Compu. If you have to ask how to build stuff, you're at the wrong place. You're supposed to be at school! Study electronics instead of asking other to do your work.
Compu
Idiots
Monday, October 24, 2011 10:28:44 AM
Wow, what a bunch of morons asking inane and stupid questions. If you need to ask retarded questions like "UHH I DONT NO HOW 2 BILD A TRANSMITER PLZ HELP MEE", then you clearly don't have the brain power necessary to understand this. OP: Very good information, should be immensely useful for beginners.
UncleReggie
SIMPLE Transmitter
Friday, September 16, 2011 5:04:19 PM
Hello. Can anyone explain how I could build a VERY simply (i.e. morse code) transmitter using nothing more than household objects. Ideally, one which could be picked up by a crystal receiver. Many thanks.
kris
FM Transmitter
Sunday, June 05, 2011 12:31:22 AM
Im a amateur in Soldering and in EC. Can i easily build a transmitter. i have never done a EC project :(
Rahul
FM Transmitter
Saturday, January 01, 2011 10:26:03 PM
Hey the transmitter is working but I am able to recieve sound on destination reciever ONLY when I BLOW in the ELECTRET MIC i.e MY VOICE is NOT transmitted via the Fm transmitter. Pls help....
Owen
FM Transmitter
Thursday, December 09, 2010 9:33:35 AM
Is there any matched receiver circuit? I would like to build a walkie talkie type thing.
Th3_uN1Qu3
FM Transmitter
Tuesday, November 23, 2010 1:25:00 PM
The second inductor is for decoupling the antenna from the tuned circuit so that moving the antenna does not affect the frequency (a lot). No matter what you do to it this type of circuit will never be stable. Best way to transmit in FM now is to get a car FM modulator with audio input or a Belkin Tunecast and hack that up. With an amplifier using a single RF transistor it is easy to boost the output of those things to several watts. Be on the lookout for the car modulators with LED display and no fancy features, the ones with complex LCD displays tend to have whistling noise that you can't get rid of.
maggie
FM Transmitter
Tuesday, November 09, 2010 7:25:01 AM
can some one tell me the use of the second inductor connected to the antenna. if i remove the second inductor and connect antenna directly will it work? thanks
omkar
FM Transmitter
Friday, October 15, 2010 9:20:22 AM
i have found many ckts for a radio transmitter, will anyone tell me how many ckts do we have for a single device coz i m not able to understand which one to choose. i have already tried to make a radio transmitter from two different types of ckts but none of them worked.........plz someone help me with this
Basit khan
FM Transmitter
Wednesday, October 13, 2010 10:16:22 AM
can u run this on 4.9 Volts. will it work if not can u suggest a circuit that works on this much input
ciaran
FM Transmitter
Friday, September 03, 2010 8:00:10 PM
currently working on this one with my group for our subject Communications..while the other group in my class was assigned to make an AM receiver...
RAHUL
FM Transmitter
Wednesday, August 18, 2010 8:09:30 AM
HEY WORKING REALLY GOOD...!! BUT HAS VERY SHORT RANGE... FOR THOSE WHO ARE HAVING PROBLEM ... REGARDING INDUCTOR: 1.BUY ENAMEL COATED MAGNETIC WIRE TO BUILD INDUCTOR. 2. CUT WIRE INTO TWO PIECES : 8cm EACH. REMOVE ENAMEL COATING FROM BOTH ENDS OF WIRES.& CHECK THE CONTINUITY 3. TAKE A PEN REFILL (LEXI,CELLO ,TECHNO TIP.ETC ) WHICH HAS OUTER DIAMETER OF 3.2mm approx. 4. WIND WIRE ON REFILL (5 TURNS). 5. DONT BEND WIRE WHILE WINDING, REGARDING CAPACITOR: 1. IF YOU DONT HAVE VAR. CAPACITOR THEN CONNECT ANY FIXED CAPACITOR (disk) BETWEEN RANGE OF 3-18pf. REGARDING ANTENNA: 1.YOU CAN CONNECT SIMPLE WIRE ALSO. REGARDING RECEIVER. 1, IT WORKS VERY..WELL WITH CELL PHONE RADIO RECEIVER DUE TO HIGH SELECTIVITY.( VERY CLEAR.) TUNE IT IN AUTOMATIC MODE. 2.WORKS VERY VERY POOR WITH TRAD. RADIO RECEIVERS. REGARDING TRANSISTOR: ...I USED 2N2222A . DRAWBACK: 1.SHORT RANGE. BEST SOLUTION: 1.BUY LESS TOLERENCE COMPONENTS. FOR MORE COVERAGE.. 1. PUT POWER AMPLIFIER BEFORE ANTENNA. (FOR POWER AMPL. .....SEARCH ON GOOGLE ).
anonymous
FM Transmitter
Wednesday, June 16, 2010 11:14:01 PM
For those asking to further the range. You can easily amplify the signal, but after grabing a certain distance the fcc will get on your tail.
fm TRASCE
FM Transmitter
Thursday, June 10, 2010 2:47:38 AM
DOES NOT WORK!!!! i have put 18 AWG coils! What to do!
anonymous
FM Transmitter
Thursday, June 03, 2010 11:38:36 PM
Im a thirteen year old and i want to build 1
anonymous
FM Transmitter
Monday, May 24, 2010 12:45:07 PM
Is their anyway to test the circuit without having to search through every radio frequency? A fast reply would be greatly appreciated.
anonymous
bbn
Thursday, May 13, 2010 4:10:56 AM
i try 1.3watt fm transmitter amplifier with 2sc1970 & c2053 its the best .... check google search
anonymousnerd
FM Transmitter
Tuesday, April 13, 2010 5:38:03 PM
Hi, My brother and I are planing to make two for a intercom, is this to powerful for indoor use? Or is it just that you do not want people using it as a bug? Thanks a lot, AnonymousNerd
K
FM Transmitter
Tuesday, April 13, 2010 7:58:13 AM
I am not an enginer, I do not know how to build a transmitter but I need someone who can get me one. Thank you.
Genesis
FM Transmitter
Monday, March 29, 2010 3:16:57 PM
How can i produce a desired frequency?? What parameters should i change to get a lower frequency radio wave?
amor
FM Transmitter
Wednesday, March 24, 2010 4:28:42 AM
what is the substitute for 3-18pf adjustable cap??
nimit goyal
FM Transmitter
Tuesday, March 09, 2010 3:22:51 AM
i want to open a fm radio station in my colage...what would be approx expense for range up to 3 km...what all shall i be needed...
KISHOR KUMAR TIWARY
FM Transmitter
Sunday, February 14, 2010 11:20:37 AM
Can you give me a more powerful (range: around 2-3 km) Fm transmitter circuit diagram. It could be very useful for transmitting songs to all fm mobiles and fm radio from my mp3 player for free.
Trance
FM Transmitter
Tuesday, February 09, 2010 2:20:06 AM
I'm back. Works great. I haven't got it to go no more than 100ft or so. Not sure if its the antenna, longer? It works without the Variable Cap but can't tune it using a regular 5pf Cap. Got my iPod to play from it but its really hard to get a clear signal and it decreased the distance to like 3ft or so. I also used 30-22AWG wire and it still works. To increase the distance I believe one can build a special FM Amplifier but I haven't gotten to that yet. Its been fun and thank you for providing this circuit.
Ammad Ali
FM Transmitter
Sunday, January 31, 2010 3:02:36 PM
what can i do to increase the range of FM transmitter?
Trance
FM Transmitter
Monday, January 11, 2010 7:31:55 PM
I'm fairly new to electronics and in trying to build this circuit I came across a few answers. You absolutely need an adjustable capacitor with the recommended value to tune your cicuit to the desired FM frequency. It is super sensitive so grab a radio and look for what frequency you are on. Also after the circuit has been on for a while the frequency changes when heat builds up so you have to keep adjusting it. I also found that putting a 10k and 4.7k resistor in series to the + terminal helped my electret mic(from Radioshack) pick up more sound. I'm sure you can use 26AWG or 30AWG. Best advice is get a breadboard and test every question you have. I am not finished with this circuit yet. I still have alot to learn. I'm sure you can hook up any output instead of a microphone but I will try it.
SUBBHHAJIT
More powerful FM Transmitter
Tuesday, January 05, 2010 12:40:19 PM
Can you give me a more powerful (range: around 1-2 km) Fm transmitter circuit diagram. It could be very useful for transmitting songs from my mp3 player to my easy portable mobile.
arjie
FM Transmitter
Friday, November 20, 2009 8:15:37 PM
hey, i would like to know what is the frequency used in this fm transmitter. I would like to build my fm transmitter for my design project and what is its gain and output power? can you give me a complete computation about the above questions i have already mentioned?
ERIC ANSAH
FM Transmitter
Monday, November 02, 2009 11:00:54 AM
HI, WANT TO KNOW THE DIFFERENCES BETWEEN FM TRANSMITTER AND AM MODE OF TRANSMITTER AND HOW FM TRANSMITTER CAN HAVE A STABLE GAIN
cabelm
FM Transmitter
Friday, October 16, 2009 6:03:40 AM
I build it, and it works realy good. Thanks
anonymous
FM Transmitter
Friday, October 02, 2009 1:12:33 AM
How can i produce a desired frequency?? What parameters should i change to get a lower frequency radio wave?
saad
FM Transmitter
Sunday, September 20, 2009 12:36:57 PM
hi is this necessery to make the circuit as shown on the fig 3 of pcb mean that can the position of components can be changed??? if not then why??? can i make this on varo board?? sorry for any grammer mistak saad pakistan
BADAR SUHAIL
FM Transmitter
Sunday, September 13, 2009 3:49:06 AM
please can somebody tell me if the indcutor specifications do not meet.i.e if 28 AWG enamel coated magnet wire is not available. can i use a simple coil and wind it. also it is nessecary to use a variable capacitor?
Nitin
FM Transmitter
Saturday, September 12, 2009 4:29:44 PM
May I connect something else than electret microphone? Maybe a plug from computer?
Viraj Mehta
FM Transmitter
Thursday, September 03, 2009 7:54:05 AM
I want to know the specifications and uses of all the components used in this circuit. Please anybody send me minute details of the components and their purpose.Also I WANT TO KNOW ABOUT THE 5.6uF CAP. AND POSSIBLY A SUBSTITUTE AS ONE IS NOT AVAILABLE PRESENTLY.SECONDLY I WANT THE DETAILS ABOUT THE WORKING OF THE INDUCTOR COILS.These two are primary objectives and then the rest of the other components. Please somebody ler me know about the components' working and oblige.Thanks.
Bojan Andrejek
FM Transmitter
Saturday, August 22, 2009 11:20:08 AM
May I connect something else than electret microphone? Maybe a plug from computer?
scode
FM Transmitter
Thursday, July 23, 2009 12:45:27 AM
What is the value of the inductance when wound as specified?
Spitso
FM Transmitter
Sunday, July 19, 2009 10:15:29 AM
Hey guys just finished building this circuit. It does work but is very tempremental. As soon as something comes within 30cm of this circuit it changes the frequency of the transmitter, or as your battery drops its voltage frequency also changes.
anonymous
FM Transmitter
Tuesday, July 14, 2009 10:48:50 PM
@ Chris Why don't you just learn some of that stuff at least the basics so you can read this. You don't need to know everything related to electronics to make this thing. The only thing you need to know is how to identify the pins of the transistor. that is the only thing that you cannot understand by looking at this diagram. Even then with the the a pc board diagram shown here You don't need to know anything about that. If you google everything you don't understand you would know how to build this in and hour or two. The lines are wires the symbols are different components and some have + - sides like batteries and some don't. You just have to figure out which end is fixed to which wire(basically what goes where) and solder them or use a thing called a breadboard where you just have to plug everything(no soldering). For your information this is a very easy transmitter to make. And if you seriously want to make this I'm sure you'll just Google everything and make one. if you are unsure make a small Led blinking circuit first to get a hang of everything. I repeat its not hard but you have to make an effort. Asking for a better diagram and better explanation for this circuit is like asking for a cab to pic you up near you bed so that you would't have to learn how to walk to the door.
Arifuddin
FM Transmitter
Wednesday, May 27, 2009 6:16:59 AM
i am going to try this. we can use a fixed capacitor (say 10pf) and we can alter the coil length to get the required frequency. Testing this circuit requires a lot of patience as u have to tune it to know the resulting frequency. I prefer u to use a phone with fm receiver. search for stations and u will probably know your frequency. Hope this will help u a lot. enjoy [:)]
tacal
FM Transmitter
Friday, April 24, 2009 6:34:57 PM
In what frequency(channel) do this transmitter send information
dre
FM Transmitter inductors
Saturday, April 18, 2009 10:58:35 AM
Hello I am building a low power fm transmitter and I believe the last step I'm having trouble with is the inductor coil and making sure I have it correct does anybody have some good knowledge on inductors and how to make sure u have it correct? Thanks
anonymous
FM Transmitter
Tuesday, April 14, 2009 11:01:46 PM
bulit one but it does not work, i think the core part of it is the LC circuit, if the inductor or capaciotr value varies, the osillating freq can easily out of range between 88~108MHz
Marco
FM Transmitter
Friday, April 10, 2009 11:41:50 AM
sine: The capacitor needs to have approximately the same range (e.g., 2-20, 5-15, ...) to stay in the same frequency band. If you stray from this range, you'll need to compensate by changing L2. Chris: If you can't read a schematic, you don't want to attempt this project. Start with something a bit simpler to get your experience level up a bit. It's easy build a ckt that won't tune into the FM band if you're not careful with layout, etc. Vinod: The capacitor between C and E is to provide feedback to make the circuit oscillate.
anonymous
FM Transmitter
Saturday, March 21, 2009 12:34:44 AM
This should work fine. Download "LT Spice IV" amd you'll see it works just fine. I built this 35yrs ago and as kids we had a lot of fun (in the UK, the police band was just above the commercial FM band and this circuit tubes there too!), THe circuit I built then had a POT accross the microphone to adjust adio sensitivity - that may be needed here. I also reacall the circuit is very temperamental even when your hand comes close it stops (or starts) working. Play with that and tweek the coils, you'll get it working. Tomorrow I will build this with my 12 yr old son.
zangora
FM Transmitter(broadcast station) in Africa
Monday, March 09, 2009 6:51:54 PM
Sir l would like you to provide me an advise as how to set up an FM station with range of 70km.and also provide me with the sites where l can get a reasonable deal.Actually am looking for used equipments with computer.
alemayehu-bulti
fm tranismiter
Saturday, March 07, 2009 8:05:05 AM
hello dear iam live in ethiopia at the western waht ihave acommet is iwants to work atransmiter but i couldnt get the transister type like2n3866 the same as other can u support me how ican get it or equievalent pleas support me thak u
sharptones
FM Transmitter
Saturday, February 21, 2009 12:46:11 PM
tempting to build one. But does it really work? I need to know cuz there's no point in building something that wont work in the first place.
Chris
FM Transmitter
Thursday, February 05, 2009 5:25:57 AM
Hey i am not very good with electronics but i would like you to send me a pic or something that shows me how to make a very easy FM transmitter, but not a diagram that says r1, r2, 10k resistor and all that stuff can you step me through what i have to get, what it looks like and where to put it
Maxx
FM Transmitter
Wednesday, February 04, 2009 5:04:21 PM
Guys plz help. I made this circuit and it didnt work. I didnt get the exact VC and wire. Please tell me is there any substitute for varicap and wire used.
sine
FM Transmitter
Saturday, January 31, 2009 12:56:55 PM
what value of capacitor can i use in place of the 3-18pf adjustable
yeah
FM Transmitter
Monday, January 26, 2009 12:43:34 PM
I built this, and it worked on the breadboard, but when I put it onto PCB it didn't work. Turns out it's only oscillating up to ~50Mhz now, should be easily fixed by messing with cap values. Moral of the story is, if it's not working, check it on an oscilloscope and make sure it hits the right frequency range.
al
FM Transmitter
Monday, January 12, 2009 9:09:32 PM
this circuit is very good just dont construct this on pcb , simply soldered the components together, i also used dipole antenna, it works, w/ range upto 1 km on a good quality recevier, 500 meters on my walk man,
Vinod.S
FM Transmitter
Tuesday, December 23, 2008 11:58:15 AM
What s actually an electromagnetic wave? Is there any magnetic field transmitted from the antenna of an FM transmitter? What is the function of capacitor between emitter and collector of the output transistor? What is actually happening in the transmitting antenna?
ash
FM Transmitter
Tuesday, December 23, 2008 5:50:53 AM
i had finish repairing my FM Transmitter but it does not work
supun
FM Transmitter
Friday, November 14, 2008 3:50:38 AM
this circuit is ok
anonymous
FM Transmitter
Wednesday, November 12, 2008 5:01:29 AM
What a bunch of morons asking a bunch of braindead questions. I assume the target frequency is 88-108Mhz, to match the average IQ of the contributors here. Sorry for the dumb comment, just thought I'd try to fit in.
ROEJONO
FM Transmitter
Sunday, November 09, 2008 12:57:23 AM
this doesnt work it wont turn on i get no tuning or anything
saad
FM Transmitter
Tuesday, October 07, 2008 1:48:17 PM
If i only want to transmit at 88 Mhz, what value of capacitor should i use instead of the adjustable capacitor
anique
FM Transmitter
Saturday, September 27, 2008 2:06:44 PM
how do i bypass the battery with .01uf capacitor
anonymous
FM Transmitter
Saturday, September 27, 2008 9:07:45 AM
i had finished doing the fm transmitter.My only problem is that i only have little ideas about this circuit and i need more for my written report.can you please provide me the ideas i want to know aabout this fm transmitter especially it's function and the role of its parts?
MUKESH
FM Transmitter
Saturday, September 27, 2008 1:51:32 AM
your fm circuit does not work while we use condenser mic and send simmiler transister of 2N2222A
MUKESH GOYAL
error in fm transmeter
Sunday, September 21, 2008 4:43:45 AM
I make fm transmeter by using your circuit but it do not work,why? And I used condenser mic
anonymous
FM Transmitter
Saturday, September 13, 2008 8:28:17 AM
Does it mean that, all modulation and amplification also done by this circuit ? Please let me know about this. Thanks karthik
sammy
FM Transmitter
Tuesday, August 12, 2008 12:53:07 PM
On which frequency i can pick up the signals. The Q2 transistor happens to be very hot easily. is it normal thatway
JASON
FM Transmitter
Tuesday, August 12, 2008 12:03:38 PM
hello,how do i bypass the battery with .01uf capacitor and what its job.thank you from jason
jhon
FM Transmitter
Monday, August 04, 2008 9:41:11 AM
Just finished mine, its awesome, works perfectly, thx!
anonymous
FM Transmitter
Friday, July 25, 2008 8:54:31 AM
on which frequency i can pick up the signals
someguy
FM Transmitter
Monday, July 21, 2008 4:10:51 PM
i got the fm transmitter working but it still has a lot of interference. however i am not use a variable cap instead i am using the cyrstal or cap i do not know what its called that you get from a remote for a radio controleld car at 49 mhz and the radio still picks it up and the frequncy on the lcd diplay magicly changes. Weird! if anyone knows whats wrong plz send a email reply or comment back
EAGLE AMINDI
FM Transmitter
Monday, July 21, 2008 8:04:05 AM
the trasmitter is quit simple but i think that more explanations should be given about the circuit connection
anonymous
FM Transmitter, More Power
Sunday, July 20, 2008 5:37:44 AM
and i can make the antennae as long and tall as necessary and a custom receiver. i just need the signal to be heard clearly and reliably at the other end. I'm also not going to be in the standard radio range. i basically just need ways to make the components take more volts and then push that to the max then make up for whats left with antennae height. Thanks for your help. :)
anonymous
FM Transmitter, More Power
Sunday, July 20, 2008 5:18:10 AM
What would it take to boost this thing to a range over 8,500 w/o burning out any components? i calculate 255 volts but that would certainly fry almost anything. i was looking for something to take and boost the outgoing FM signal instead but no luck so far.
FREDRICK ODONGO OTIENO
FM Transmitter
Saturday, July 19, 2008 4:29:01 AM
im in need of a circuit that will transmit at a distance of 100m for only audio if any one has one that has made into trial and has worked please send it to me i will appreciate.
anonymous
FM Receiver
Monday, May 26, 2008 8:36:48 AM
How to build simplest FM Receiver ?
anonymous
FM Transmitter
Monday, May 19, 2008 3:06:52 PM
hey i got info about how to make a long range fm transmitter...that has a range upto 70 kms..but is its making is not easy and the components needs to purchased..there are very few shops even where u get all that components u need..plus u would need to make all the coils on yr own witth high amount of accuracy..
ELEC
FM Transmitter
Thursday, May 15, 2008 12:14:54 PM
Does anyone know at what frequency can you pick up the signal? (say you are using a FM radio)
tushar apa
FM Transmitter
Monday, May 12, 2008 6:12:21 AM
this circuit is very easy
RanjanLama
FM Transmitter
Monday, May 05, 2008 8:00:10 AM
Hi I making fm transmitter but didn't success. Pls. can anyone help me to provide with working schematic diagram of FM transmitter. would be greatful if you also provide all detail calculation and comments on it. cheers
prakash chand
FM Transmitter
Sunday, May 04, 2008 9:29:28 AM
how to make a fm transmitter with a 5 km range and a also a highly sensitive fm receiver.
bitzero
FM Transmitter
Saturday, May 03, 2008 10:14:36 AM
has anyone measured frequency response and signal to noise ratio? i plan to put this in my car with my laptop since we have no good radio stations in the mississippi delta!
hussein
FM Transmitter
Wednesday, April 30, 2008 12:18:58 PM
i want to know if an FM receiver receives the signal it can be generate electricity with some special Hardware .??
Michael Muller
FM Transmitter
Tuesday, April 15, 2008 2:46:56 PM
How far will a 10watt FM transmitter broadcast, assuming a good antennae? What's the radius, or range? 5 miles? We are fundraising for a LPFM station and may use this circuit for our transmitter until we have the cash to buy a new, more robust transmitter.
biswojit nayak
FM Transmitter
Tuesday, April 15, 2008 2:38:03 PM
how to make a fm transmitter with a 5 km range and a also a highly sensitive fm receiver. also pl send me the substitutions for the coil of th trans.plz give some theoryticaly and practicaly dacument about fm transmitter..
Mike
FM Transmitter
Tuesday, April 08, 2008 11:41:18 PM
Does anyone know if you can run this transmitter from your computer, transmitting the signal of what ever is playing on windows media player, if so how would you do this?
eno00wen
FM Transmitter
Friday, April 04, 2008 5:53:02 PM
what do the wire coils do exactly are they acting as inductors? do they have anything to do with getting the the dc voltage to oscillate?
SamTechnologies
FM Transmitter
Tuesday, March 18, 2008 2:38:21 PM
The transmitters is a very basic one U can increae the signal strenth a little by increasing the capacitor betwheen emitter & collector of the filnal RF transistor up to about 22pf.Try it & u will see the differece.
absssss
FM Transmitter
Tuesday, March 11, 2008 8:57:25 AM
how to make a fm transmitter with a 5 km range and a also a highly sensitive fm receiver. also pl send me the substitutions for the coil of th trans.
khumbula sithole
FM Transmitter
Monday, March 10, 2008 8:56:22 AM
I have Absolutely no knowlegde about Fm transmitters, but I have a dream of running a low cost radio station in my neighborhood with a radius of aproximately 10km.What do I need.
TomFred
FM Transmitter
Thursday, March 06, 2008 3:21:06 AM
My experience told me that no matter how it is boasted to be well signal transmission, FM transmitter like this always delivers a litter noise in the back ground. As the range, far enough. Most of the case are i used it in car with car stereo.So basically, it satisfied me. Which i had expected some worse. The prices of this kinds of gadgets are downright cheap these days.
spritual ram thapa
FM Transmitter
Monday, March 03, 2008 12:49:37 AM
i would like to increase the transmitter range ,what would i do for that? thanx
Anurag singh
FM Transmitter
Wednesday, February 27, 2008 2:33:35 PM
I want to make a long range FM XMITTER as my final year engg. project. can u plz. help me?
danish
FM Transmitter
Tuesday, February 26, 2008 10:12:12 AM
i find ur layout simple & i will make it
Alok
FM Transmitter
Saturday, February 23, 2008 6:44:12 PM
I want to replace the mike with a Cord as an input to Computer so that the songs played in computer can be transmitted.
aadhi.mesce
FM Transmitter
Saturday, February 23, 2008 4:40:11 AM
i want 2 make a trnsmtr with the mic is replacd with a mp3 player...... 4 that, wat changz should done in this circuit.........??? pls help me..!
anonymous
FM Transmitter
Thursday, February 21, 2008 12:09:54 PM
Does anybody have a .pcb file for this so it can be used in pad2pad?
Hydro
FM Transmitter
Sunday, February 17, 2008 12:05:37 PM
I have a 433.92 MHz receiver that i would like to use to receive signals sent from this transmitter. What value of C5 would i need to use?? Thanks in advance My email is Hydro_dmc@hotmail.com
nirdosh
FM Transmitter
Saturday, February 16, 2008 1:12:38 AM
the transmitter is ok but u need to set alternatives for the coil wire also.
hotp
FM Transmitter
Thursday, February 07, 2008 1:22:52 PM
this doesn't work for me!for what reason nd where woul we put the battery bypasser (note 5).doesn't an air coil is made without the need of using nail polishing in it? thanks
Frank
FM Transmitter
Thursday, February 07, 2008 12:50:09 PM
Would it be possible to remove the mic, and attach an audio source like a mp3 players headphone jack output to this circuit?
lem
FM Transmitter
Wednesday, February 06, 2008 3:29:01 AM
i want to have a very simple fm transmitter with a minimum range of 50 meters, can you help me please? i want a simple and not complicated circuit for my final project. and also a less expensive components....please help me!...thnx so much in advance!....
lem
FM Transmitter
Wednesday, February 06, 2008 3:12:52 AM
thnx for your circuit. i'll try this one for our final project.
anonymous
FM Transmitter
Monday, January 28, 2008 11:01:51 AM
For L1 & L2 can we use inductor with about 1mH inductance instead of AWG wire. It is hard to get AWG wire in this part of the world!!
francis
powerful UHF & VHF antenna
Monday, January 28, 2008 5:39:05 AM
please i have try most of your circuit and is very affective as you stated, now i need very powerful UHF & VHF antenna please in know you can help me of it.
Wyatt
FM Transmitter
Saturday, January 26, 2008 11:36:51 PM
Would it be possible to remove the mic, and attach an mp3 player in its place? If so, could it be done easily? (like simply taking a pair of ear phones and cutting them and attaching the wires to the transmitter)
Damian
FM Transmitter
Saturday, January 26, 2008 3:29:24 AM
How is dimension of board. Please help me . If these transmiter fm ready is operative???. please help me i'm young electronic from polen
griff
FM Transmitter
Tuesday, January 22, 2008 1:47:25 AM
I have built the transmitter carefully using maplin parts and the mic salavged out of a pocket pc, the coils I made were constructed from 30 SWG as Im from the uk and AWG is hard to find so 30 SWG was the closest I could muster. I used clear nail varnash to hold them together and it is currently on breadboard working a treat! voice modulation is very sensitive from across my lounge and I even tested it using CW (morse) and it worked perfectlly. However It seems battery voltage is critical in its oscillation and require 8.5+ voltage. All in all a fun project that works surprisinly well with a good range and penitration through walls.
nath
FM Transmitter
Monday, January 21, 2008 10:53:54 PM
please guid me for desining fm transmittre & reciver This project choose me due to my collage which is used for security & daly anocingparpose so .............. d.nath
sunil
FM Transmitter
Monday, January 21, 2008 10:58:46 AM
i have seen ur circuit but its power is very low and it is not working for usable distance how can i increase power upto range 2 km
rehan
FM Transmitter
Monday, January 21, 2008 8:48:56 AM
Good Day, I appriciate your site. Its Really helpful for young electonic engineers. But I am trying to work on a security transmitter. That at the push of a button, signals are transmitted for a point to one or more recievers that can be a lot of distances away. What circuit can you recommend. Both for the transmitter and reciever? thank
Surya
FM Transmitter
Saturday, January 19, 2008 3:55:31 AM
I want to make a module that opperated minimum from 25Km.So plz send me circuits of fm transmitters or wireless systems which can opperated from maximum distence
Reply Sleeka
FM Transmitter
Wednesday, January 16, 2008 4:10:36 PM
The adjustable cap is a frequency filter so you might wanna look for low pass and high pass filters (They're basically just caps and resistors connected parallel to ground),
boudjemaa
FM Transmitter
Friday, January 11, 2008 8:57:55 AM
hello I will like to carry out a radio operator emettor and receptor and I miss experiments in this field, for that I will like to be guided and followed your share thank you. salut j'aimerai bien realiser un emetteur radio et recepteur et je manque des experiences dans ce domaine, pour cela j'aimerai bien etre guidé et suivi de votre part. merci
SAM OLATUNJI
FM Transmitter
Friday, January 11, 2008 8:50:45 AM
GOOD WORK YOU ARE DOING, KEEP ON! PLEASE I NEED CIRCUIT OF 4W FM TRANSMITTER, RECOMEND A SITE FOR ME
anonymous
FM Transmitter
Friday, January 11, 2008 12:07:57 AM
200 kilometer fm reciver avilable?
anonymous
FM Transmitter
Thursday, January 10, 2008 11:07:44 PM
I want to start a fm station in my city in coimbatore how to start i want your advice please help me
basak
FM jammer
Tuesday, January 08, 2008 12:49:01 PM
I have a project an fm jammer with scannign from 88Mhz to 108 Mhz. It isn't important range of jammer 15 m is enough can you help me???
jeffry orillanymous
FM Transmitter
Tuesday, January 08, 2008 2:05:56 AM
Good Day, I appriciate your site. Its Really helpful for young electonic engineers. But I am trying to work on a security transmitter. That at the push of a button, signals are transmitted for a point to one or more recievers that can be a lot of distances away. What circuit can you recommend. Both for the transmitter and reciever? thanks...
revannath
FM Transmitter
Monday, January 07, 2008 4:04:51 AM
good,sir i want to transmit signal arround 10-15km for with good quality for communication.how it is possible & could you tell me about sattelite comunication.i trying to make remote controlled aero model for long distance control. thank you sir.
ZEESHAN
FM Transmitter
Sunday, January 06, 2008 1:20:53 PM
It is a very good circuit which realy very much qualifies the basic need and have the extendability in it. At the student level it is a very very hekpfull circuit diagram which promots the ideas in and student mind raised.
Sleeka
FM Transmitter
Friday, January 04, 2008 4:49:32 PM
I'm trying to figure out how to change to a frequency outside 88-108MHz. Could anyone give me a few key words to Google, involving what needs to change with the3-18pf Adjustable Cap? How do I specify a different cap for different frequencies? Thanks.
Anurag Sant
FM Transmitter
Thursday, January 03, 2008 10:04:42 AM
Sir, I want to start a fm station in my city.My city is having the area of 65 kms all around.how can i start it?and is this possible to start it?what i hav to do?tell me please. thank you
ted
FM Transmitter
Thursday, January 03, 2008 8:19:48 AM
want make a wide range about 10 km fm transmitter pl send full circuitdetails.and also send what is the procedure to start fm station. how can i get frequency permission .and say estimation cost of start fm station
Adebo Paul.
FM Transmitter
Thursday, January 03, 2008 8:17:13 AM
Good Day, I appriciate your site. Its Really helpful for young electonic engineers. But I am trying to work on a security transmitter. That at the push of a button, signals are transmitted for a point to one or more recievers that can be a lot of distances away. What circuit can you recommend. Both for the transmitter and reciever? thanks.
munas
FM Transmitter
Monday, December 31, 2007 5:15:56 AM
i want make a wide range about 10 km fm transmitter pl send full circuitdetails.and also send what is the procedure to start fm station. how can i get frequency permission .and say estimation cost of start fm station
MICHAEEZINWA MICHAELLEZINWAnymous
FM Transmitter
Saturday, December 29, 2007 3:56:12 PM
Please how can i implement this cct diagram of a transmitter and test it efficiency/.
anonymous
FM Transmitter
Thursday, December 27, 2007 4:12:36 PM
Thank you editor. Your simple effective design is perfect. I applaud your patience with the hundreds of spam requests. Use google people. I can only assume thats how you found your way here. "What do the transistors do?" What are you doing on this site? lol Honestly though. Thank you for your time and effort. No information is needed. Please dont contact me at my email. :P
Bobby
FM Transmitter
Wednesday, December 26, 2007 11:09:03 PM
i want to transmit fm signul around 80km to 100km,can u show me circuit desine & is this possiable ?
anonymous
FM Transmitter
Saturday, December 22, 2007 11:40:02 PM
where can i buy a 3-18pf Adjustable Cap???
Jose
FM Transmitter
Tuesday, December 18, 2007 9:01:12 AM
Thanks a Lot for your usefull circuits. please include in your site images bigger schematics because in some computers is nearly dificult see the diagram details. Thanks anticipated.
papai
FM Transmitter
Sunday, December 16, 2007 7:05:37 AM
i want to build up a fm trnsmitter whose operating rang should be above 20 km
morgan
FM Transmitter
Saturday, December 15, 2007 12:58:01 PM
can i use 1 or 2 21 uF capacitors instead of 2 10 uF caps?
Petar
FM Transmitter
Saturday, December 15, 2007 9:11:37 AM
Can anyone tell me dimensions of coil ?
M
FM Transmitter
Monday, December 10, 2007 6:18:40 AM
What is the equivalent inductance of the 5 turns AWG coil? I need to know that to check if i done it correctly
jeremiah
FM Transmitter
Sunday, December 09, 2007 11:27:04 PM
what is a trimmer?
Joe
FM Transmitter
Sunday, December 09, 2007 10:33:32 PM
Can someone tell me what frequency this runs at, or where to find a schematic for the receiver?
Ishan
FM Transmitter
Saturday, December 08, 2007 4:53:14 AM
This circuit is workng properly bt sm distrbance is there. Instead of adjstng capicitor of 3-18pf a trimmer cn b usd.
xbmwbryx
FM Transmitter
Friday, December 07, 2007 12:02:50 PM
i recleanup a small schematic check to see if all connectyions are correct. I was worried after drilling hols the pads would tear. this one has more even pads and better holes.
jeremiah
FM Transmitter
Thursday, December 06, 2007 9:02:12 AM
can anyone send me how did the author get the values for the capacitors and resistors in this circuit? i really, badly need for my electronics design project, pls help me, thanks..
vinoth
FM Transmitter
Wednesday, December 05, 2007 8:36:56 AM
i want make a fm transmitter up to 5 km range .can u help me
vinoth
FM Transmitter
Wednesday, December 05, 2007 8:32:27 AM
i want make a fm transmitter pl send full details.and also send what is the procedure to start fm station. how can i get frequency permission .and say estimation cost of start fm station
kencbk
FM Transmitter
Sunday, December 02, 2007 6:11:16 AM
i can't get this fm transmitter working, can someone help me? just send me further details and tips on making this. thank you.
nabin neupane
FM Transmitter
Sunday, December 02, 2007 5:31:47 AM
what is the working principle of miniature fm transmitter?
vinnie
room bug shematic
Thursday, November 29, 2007 11:44:28 AM
does anyone know the EXACT parts and shematics of the small room bug that is shown in the book '101 spy gadgets for the evil genuies' or a quick pic of it is on atomiczombie.com if anyone can help me out with how to make this bug it would be highly apprechiated. vinnie
McMiller
FM Transmitter
Tuesday, November 27, 2007 10:02:43 PM
I would like to buy a FM transmitter that can brodcast up to 5 miles, do you sell them here, or is someone willing to selll me one, I have no time to learn how to build one and I cant find any onlkine to purchase. I would like to play radio show programs from my pc and have it reach out to all the people in my small town at most 5 miles, more like 3 , can anyone help my out!
Flusscent
FM Transmitter
Monday, November 26, 2007 1:09:39 AM
I have a 5W transmitter w no antenna... whats a widely available way to get a good innercity range with this device (5 miles)? thanks, please email teenagepillparty at hotmail
anonymous chris munene
FM Transmitter
Saturday, November 24, 2007 3:13:17 AM
am planning to present a project on this topic and i think this circuit looks abit simple but does it go along with anything or by just making the circuit on a circuit board will be enough?please help me,any one.
doel
FM Transmitter
Friday, November 23, 2007 9:30:03 AM
thank 4 ur information...
Kamto
FM Transmitter
Thursday, November 22, 2007 9:10:36 AM
It's very good for broadcasting in campus and other
anonymous
FM Transmitter
Tuesday, November 20, 2007 8:24:46 AM
I think the fm transmitter is great and very efficient.I was doing a project on radios and I found it very useful.THANX ALOT!!!
Tom
FM Transmitter
Friday, November 16, 2007 5:49:51 PM
Its great, costs £1.50 in total from bitsbox.co.uk excluding Mic and board!
Bilal
FM Transmitter
Friday, November 16, 2007 1:08:46 PM
i a maked a 5 km raing fm transmitter.you sending my mail adress his diagram & component list. & his cost
Amos
FRS Transmitter Wanted
Friday, November 16, 2007 7:39:29 AM
How would one modify this (or another xmitter) to transmit in the 460MHz "Family Radio Service" (FRS) band? I am not satisfied with commercial FRS units. Any info on an appropriate receiver would also be appreciated.
andy
FM Transmitter
Tuesday, November 13, 2007 1:47:46 AM
i want to make project on these topic so anyone can help me to give all information on fm transmitter so that i can present whole information step by step with proper circuit diagram and n easy language.... if any one can help me please send me an email with topics information and all
mithun patra
FM Transmitter
Monday, November 12, 2007 2:50:44 AM
i want to start an fm station in our college. how much cost it will take and can i use this above transmitter ?
habibullahkhan
FM Transmitter
Saturday, November 10, 2007 10:49:30 PM
i want to build an fm transmitter havinga range only five miles .plz help me for this
Tariq_engr
FM Transmitter
Friday, November 09, 2007 10:39:08 AM
When i connect the transmiter with adapter(power supply) it make extra noise with sound how to overcome this problem
anonymous
FM Transmitter
Thursday, November 08, 2007 6:36:48 AM
can you please give me as much information as possible on how to improve a CHAO YU cymp3tx2R1 f.m. transmitter I have. This transmitter is sold as an mp3 to HI-FI gadget. The case is white plastic,using two 1.5 volt batteries.Thanks very much my friend!
godbless
FM Transmitter
Wednesday, November 07, 2007 2:35:05 PM
we need a very complex circuit on fm transmitter
stamko
FM Transmitter
Monday, November 05, 2007 7:11:06 PM
If i want to use this transmitter at car supply ( 12v ) is necessary to make some changes? please if somebody know, email me
anonymous
FM Transmitter
Monday, November 05, 2007 5:44:14 AM
i also wanted to get a fm receiver circuit for this frequency transmitter can u please tell me
amit sharma
FM Transmitter
Saturday, November 03, 2007 10:34:31 AM
how can i make a FM trnasmitter for make a radio station. which can broadcast to much kilometers. my city population is 5 lakh and how can they all recives my broadcast on their radio-sets or mobiles.
anonymous
FM Transmitter
Friday, November 02, 2007 7:26:33 PM
this transmitter is great, i'm using as a wireless radio beacon. thanx!!
Sameer Kumar Burman
Transmitter and reciever of 2 ghz signal
Wednesday, October 31, 2007 4:04:15 AM
pl send me the circuit details of transmitter and receiver circuite of handling 2 g hz signal appx. 150 watt power
anonymous
FM Transmitter
Wednesday, October 31, 2007 1:20:49 AM
Would changing the 5.6pf capacitor to either a 5pf or 6pf significantly affect operation?
sufyan hashmi
FM Transmitter
Saturday, October 27, 2007 7:41:30 AM
hay mudasar!! have u find any help regarging that of FM radio station. if yes then do mail me . will wait for it.tc
Felipe
FM Transmitter
Monday, October 22, 2007 11:04:57 PM
It doesnt work, impossible to get the correct frecuency on the radio and/or transmitter
Harvest Christian Centre
FM Transmitter
Monday, October 22, 2007 11:55:12 AM
we are a church organization that wants to start up an fm radio station. please help us with the data on how to best do it and the relative cost involved.
Kevan
FM Transmitter
Sunday, October 21, 2007 4:45:51 PM
Do you have a schematic for a 216mhz crystal controlled low powered small transmitter as used in tracking small birds
mudasar
FM Transmitter
Tuesday, October 16, 2007 9:42:36 AM
i wanna start my owne fm radio station in lahore pakistan how can i start plz tell me
ravinandan
FM Transmitter
Monday, October 15, 2007 8:42:46 AM
sir plz send me information about the requirements which i needed for setting a transmitter in my local village,what money i have to spends and also tell me about companies which gives such equipments
Phindile
FM Transmitter and Receiver
Sunday, October 14, 2007 2:50:20 PM
Sir can you please send me the schematic of the receiver which is working with the transmitter which is given in the page, I berg you, can you please send it urgently.
Yammy
FM Transmitter
Saturday, October 13, 2007 12:49:33 PM
Sir, iwant to know the voltage of each capacitor used on the fm transmitter circuits. Plz Sir, Keep me posted.
franklin
FM Transmitter
Friday, October 12, 2007 9:53:40 PM
can u pls help me on how to build a simple radio transmitter with the use of computer mother board
onnchai
FM Transmitter
Thursday, October 11, 2007 10:33:37 PM
do have any FM transmitter and recieve circuit ? can i using FM to tranfer the video signal? I have 1 project any advice I.one ccd camera II. one tv *distence 4m-6m can i using anyting to transfer video signal? Thanks for your reply!
Sachchidanand
FM Transmitter
Tuesday, October 09, 2007 9:16:23 AM
sir i ve 2 make my own fm transmitter station in my area through which my transmitted programs woulb be heard by other people on their mobile phone plz guide me sir send me whole procedure + circuit diagram 4 this Sir plz fast my tech fest is near. ckt must clear because I'm beginer. I'm doing b.tech ( 2nd yr)from elex branch.
chickies mp
FM Transmitter
Monday, October 08, 2007 2:29:45 PM
can we not make a forum to link technicians around the world ? this is a very good study that has not yet beenn siriuoly taken into considearation

(Editor's notes: http://www.aaroncake.net/forum)

nitinnonymous
FM Transmitter
Saturday, October 06, 2007 2:48:36 AM
how to build 350 mhz transmitter? pls tell me if any one know
maame efua
FM Transmitter
Friday, October 05, 2007 4:34:29 AM
Tell me about how an FM tansmitter wors, its risk areas, the good practices one should encourage and the bad practices one should avoid
mashood
FM Transmitter
Wednesday, October 03, 2007 2:15:43 PM
sir i ve 2 make my own fm transmitter station in my area through which my transmitted programs woulb be heard by other people on their mobile phone plz guide me sir send me whole procedure + circuit diagram 4 this
harish
fm transistor
Friday, September 28, 2007 10:34:11 AM
i want to know the cicuit diagram of fm transistor & working of the same
nithyanandhannymous
FM Transmitter
Friday, September 28, 2007 4:00:24 AM
I decide to do my project using fm transmitter.I need the clarity of the fm transmitter to be high .Which type of transmittter to use.I need a clear view
khalid awan
FM Transmitter
Friday, September 28, 2007 12:48:12 AM
i just join a fm radio station in pakistan.i want to know how to install i mean instalment of transmiteer and receiver.the comminication setup b/t them.
shaan
FM Transmitter
Thursday, September 27, 2007 11:41:12 AM
i wanna start my owne fe radio how can i start any one tell me
kris - Sabah, East Malaysia(Borneo)
FM Transmitter
Thursday, September 27, 2007 9:26:41 AM
The most stable analogue fm transmitter is using coupling coil transformer over ferite core, regulated volatage for the first stage and second stage and housing in metal case. Every stage also must be isolated using metal housing, like every person in their private small room. Crystal controlled FM transistor is also stable but hard to get intended value and builder must be good in calculating frequency doubler(multiplier). Multiplier is good to avoid output RF stage from being pickup by input stage(just like mic echo over own speaker).
anonymous
FM Transmitter
Wednesday, September 26, 2007 11:32:49 PM
how to get the receiver the can pick up the freqency of this transmitter.
electronicsFREAK
you
Tuesday, September 25, 2007 6:25:11 PM
THIS SITE IS AN ANSWER 2 MY PRAYERS!!!! YOU ROCK!
student of EL Salvador
FM Transmitter
Tuesday, September 25, 2007 3:13:04 PM
thank u this transmitter is the invent very interesting for my
janafirkhan
fm transmitter ,for 5km more no problem
Wednesday, September 19, 2007 6:19:26 AM
if you have a diagram pls send me and also you a picture of a finish board.and you can tellme how can i pay.and also how can i buy your board including the price.tnx
jobin
FM Transmitter
Tuesday, September 18, 2007 1:16:21 PM
the transmitter show is only for mono sounds..... i want a stereo fm transmitter
anERIC FLORENTINOonymous
AUDIO ACTIVATED SWITCH
Thursday, September 13, 2007 8:20:11 PM
HI,IM ASSEMBLING A RADIO REPEATER AND IM LOOKING FOR SOME AUDIO ACTIVATED SWITCH FOR THE P.T.T. OF MY TRANSMITTER..PLS HELP
anonymous
FM Transmitter
Wednesday, September 12, 2007 2:12:07 PM
i want to know who inverted transmitter
Seamus
FM Transmitter
Tuesday, September 11, 2007 11:02:53 PM
The classic 'Mister Microphone' transmitter circuit! We've built this one many times as a 'quick and dirty' project that kills a couple of hours in the construction, and then provides many more hours of entertainment to keep the kids busy playing 'radio station', and out of the adults' hair. As others have noted, the circuit can be a bit "twitchy", and sensitive to touch and proximity while adjusting the tuning. I'd recommend a metal enclosure, such as an "altoids" mint tin, being carefult to insulate the connections from the enclosure. The value of the tuning capacitor is only somewhat critical - so long as you get something close, you can tweak the coils to adjust the tuning as well. We've even built versions with fixed caps for C5, and used nothing but mechanical adjustment of the coils to tune to a specific frequency. To those who insist on asking for detailed information, documents on transmitter theory, "do my homework!" requests, etc.: Google is your friend.
The student
FM Transmitter
Tuesday, September 11, 2007 4:04:02 AM
Hei. I'm looking for some infomation about radio transmitter. Is there anyone who can tell me where I can find that? I need to find out which frequency is the lowest to go through concrete? And something like that. Thanks
anonymous
FM Transmitter
Monday, September 10, 2007 5:46:11 PM
how do u bypass the battery w/ the .01 uf capacitor?
tariq
FM Transmitter
Wednesday, September 05, 2007 1:49:36 PM
plz tel me long rang fm mic 5km
Kalle
L1 and L2 values
Tuesday, September 04, 2007 12:48:02 PM
Hi! I wanted to ask you about the values of the two coils (L1 and L2). How many nH or pH would one be? I am using enamel coated copper wire so the values might differ. Thanks in advance.
Sam
FM Transmitter
Saturday, September 01, 2007 8:59:59 PM
What is the rang of frrequency of the carieer ?
neelam shekhawat
FM Transmitter
Saturday, September 01, 2007 1:51:14 AM
can u please explain me how the circuit work?
anonymous
FM Transmitter
Friday, August 31, 2007 9:55:38 AM
Godwin sunday esu thank you for your good work God bless you continue like this and improve education starndard in nigeria thank you
nagraj
FM Transmitter
Thursday, August 30, 2007 5:53:48 AM
this ckt is good but i want to know the ckt that can transmit radiations upto 2km with obstructions like buildings etc
Joel
FM Transmitter
Tuesday, August 28, 2007 4:39:59 AM
hi can u give me an insight on radio transmitter. What kind of transmitter do i need to reach a 1km and more?
Rana Sami
FM Transmitter
Tuesday, August 28, 2007 2:28:10 AM
i want know why increes reng of fm transmitter some thing 1 or 2 kilo mitters pleez tell me
anonymous j.r.
FM Transmitter
Monday, August 27, 2007 11:39:39 PM
im interested in your FM Transmitter, sir, can you gave some explanation on how does it works? thanks...
Kunal Pimpalkar
FM Transmitter
Monday, August 27, 2007 5:23:53 AM
Hi ! This is a very nice circuit. It works satisfactorly.. But I am unable to increase it's range. How i can increase it's range? If anyone knows then plz mail me...
nirbhay gurjar
FM Transmitter
Friday, August 24, 2007 1:26:45 AM
it is good fm trasmiter
Gobi
FM Transmitter
Tuesday, August 21, 2007 2:23:01 PM
Could you explain me. how this work?
as
FM Transmitter
Monday, August 20, 2007 3:37:31 PM
hi i want the circuits transmitter and receiver, the range is about 1km . thanks
akshay
FM Transmitter
Sunday, August 19, 2007 1:21:05 PM
how it works....???
amit
FM Transmitter
Sunday, August 19, 2007 1:01:06 AM
i want know why increes reng of fm transmitter some thing 1 or 2 kilo mitters pleez tell me
akshay
FM Transmitter
Saturday, August 18, 2007 2:02:55 AM
can anyone plzzz explain me how it works....????
Ahmed Tariq Popalzai
FM Transmitter
Thursday, August 16, 2007 5:56:50 AM
Hello, i am in afghanistan & non of the components are avalble in kabul, therefore i have cant make but i am trying to get it from Pakistan. Thanks for the information & instruction
benson
FM Transmitter
Saturday, August 11, 2007 5:37:48 AM
i want to know the construction details of fm transmitter,it's applications and limitations.
benson
FM Transmitter
Saturday, August 11, 2007 5:29:05 AM
please i need to know the history of invention of a low voltage fm tranmitter,it's principle of operations and the theory behind fm ransmitter.
navid lodhi
FM Transmitter
Friday, August 10, 2007 12:19:06 PM
plz tel me the range of transmitor
anonymous
FM Transmitter
Thursday, August 09, 2007 11:11:35 AM
please, i need a lebelled diagram for FM Transmitter circuit with two transistor with mic
Hassan Abbas
FM Transmitter
Tuesday, August 07, 2007 10:12:27 AM
sir like you transmitter and kindly tell me how i cand get it
anonymous
FM Transmitter
Monday, August 06, 2007 9:39:12 AM
we need simple fm transmitter 300m
anonymous
FM Transmitter
Monday, August 06, 2007 9:15:55 AM
this circuit doresnot work, please send a proper diagram
ansuni_0_12@yahoo.co.inonymous
FM Transmitter
Monday, August 06, 2007 7:05:11 AM
please give me more details abt this fm transmutter
anonymous
anonymous
Saturday, August 04, 2007 8:20:06 PM
pls i need the construction of this fm transmjtter
pablo
FM Transmitter
Friday, August 03, 2007 10:36:20 AM
could u please send me full details on how to build an FM Transmitter similar to the one above...
sakhiya prakash
FM Transmitter
Thursday, August 02, 2007 9:45:21 AM
i want to know more about basic about fm tx one time i make this ckt running on 93.5 to 93.6 but i lost it i again make it plese help me
ahmad
FM Transmitter
Monday, July 30, 2007 2:38:30 PM
some of the components given are not avilable in nigeria, please provide them.
anonymous
Transmitter
Monday, July 30, 2007 2:11:09 AM
WHAT IS THE DIFFRENCE BETWEEN TRANSDUCER WITH CURRENT OUTPUT SIGNAL AND TRANSMITTER?
basanta aryal
FM Transmitter
Monday, July 30, 2007 1:26:30 AM
The circuit above shown cant functioning. Is the transistor works for all the frequency including audio to radio frequency?????
phaneendra
FM Transmitter
Sunday, July 29, 2007 7:15:36 AM
are there any similar circuits with out coils L1,L2.it is difficult to design them
anonymous
FM Transmitter
Sunday, July 29, 2007 12:46:12 AM
this transmitter is great like a wireless microphone... this is a 'bug'... to cover miles you need add the power amplifier at the output...
jim
FM Transmitter
Saturday, July 28, 2007 2:06:27 PM
can i substitute the mic with a 1v peak to peak input?
fuad
FM Transmitter
Saturday, July 28, 2007 7:25:00 AM
Hi I am fuad mgrakony from Syria I want to ask you around some type of FM Transmitters Pleas help me, I want to make fm station what's the best type of FM Transmitters I want one of them Its power is over 100 watts Distance transmit range over 50km Frequency range from 88MH TO 108mh Pleas help me what's the best type for me and what is the figure $ ? pleas send to me what's the best type for me and its properties on mail : Thanks Fuad mgrakony Latakia - Syria
cool viki
FM Transmitter
Saturday, July 28, 2007 3:19:19 AM
i need todevelop an fm transmitter which can work in the at 92 mhz what components i need to choose. also i need its range to be approx. 1 km.can u help me.
Tommi
FM Transmitter
Friday, July 27, 2007 12:21:32 PM
So... can we use that circuit as a tele switch (wireless switch)?? Please contact me thank's before...
yy?
FM Transmitter
Thursday, July 26, 2007 9:48:07 AM
I build thiis FM Transmitter but it dosen't to me!!! plz help me! tnx. ariel.gugu@gmail.com
anonymous
FM Transmitter
Wednesday, July 25, 2007 5:42:37 PM
anonymous you re agood engineer in electronics department,bcos i have more effort in ur previous circuits audio amp,fm xmitter e tc
JAMES
FM Transmitter
Sunday, July 22, 2007 11:12:38 PM
WHAT THE HELL IS AN FM TRANSMITTER!?
anonymous
FM Transmitter
Friday, July 20, 2007 10:02:36 AM
waste of god time does not work
anonymous
FM Transmitter
Thursday, July 19, 2007 12:22:55 AM
What is difference between FM transmitter & AM transmitter.

(Editor's notes: One is FM, one is AM.)

anonymous
FM Transmitter
Wednesday, July 18, 2007 7:43:44 AM
great
anonymous
FM Transmitter
Tuesday, July 17, 2007 7:49:46 PM
I'm looking for a FM Transmitter that gets up to 5-10 miles for cheap so if anyone can help me that would be sweet...
anonymous
FM Transmitter
Monday, July 16, 2007 11:54:51 PM
Iam intereseted to open a commercial fm radio station in Dar es Salaam,Tanzania.The city got about 4m people,I dont know it square miles.Could you advice me where to get good deal for fm radio station equipments? Regards,UM
pandya dipen
FM Transmitter
Monday, July 16, 2007 10:01:57 AM
i m in 5th ec. can u suggest me is it ok for me to put fm transmitter in state level compitation? if not then give me some idea for new project. thank u
kaveh
FM Transmitter
Sunday, July 15, 2007 1:41:13 AM
would you please send me FM transmitter circuit that can work for an area of 30KM.
kaveh
FM Transmitter
Sunday, July 15, 2007 1:40:29 AM
hi, i have made this but it doesent work.what should i do now?
imran ahmed
FM Transmitter
Saturday, July 14, 2007 6:01:48 AM
ple sent me, how to make our own fm PC Board Layout and Parts Placement in full information .
Andrés
FM Transmitter
Friday, July 13, 2007 11:18:42 PM
I was made a lots of this circuits in the past years. This circuit is some influenciable. You need a metal chasis to isolate it from external interferences if you want more stability under all environments. But it is stable if you adjust the coils and the variable capacitor and don't touch it anymore. You can enlarge or shrink the spiral separation in the coils. So, you will modify the operating frequency of the circuit. You don't need to touch the variable capacitor if you enlarge or shrink the spiral separations. Be patient because the operating frequency can easily vary only touching a component or enlarging/shrinking a little the coil. You must adjust the coil and latter try to tune the receiver. So doing that very times you can get a fixed operation frequency. And when you get that, you must fix the coils with some glue. The input voltage too influences in the operating frequency. Try to get a stable power source. When the 9V battery discharges the frequency down. Antenna: You need some 1/4 wavelength (75 cm) of wire. Any kind of wire can be an antenna (isolated or not isolated). If you need more coverage you must construct a decent antenna (search in google). Wire of coils: You can use some thelephony installation or UTP wire (0.6 mm diameter aprox.). Or same kind isolated or not but if it is not isolated you must do avoid spires touch the others.
john
FM Transmitter
Thursday, July 12, 2007 10:54:13 AM
would you please send me FM transmitter circuit that can work for an area of 30KM.
anonymous
FM Transmission Frequency - configurable?
Wednesday, July 11, 2007 5:26:11 PM
The schematic doesn't indicate any adjustable component. And this article makes no mention of it, so I assume this transmitter transmits over the range of 88-108MHz and is not configurable for a specific frequency within that range (unlike commercial FM transmitters for MP3 players)?

(Editor's notes: C5)

anonymous
FM Transmitter
Tuesday, July 10, 2007 10:21:52 AM
hi but the fequencuy of the circuit is
nellos
FM Transmitter
Monday, July 09, 2007 11:03:23 AM
i'm looking schematic fm transmitter up to 200 W
Dave
FM Transmitter
Sunday, July 08, 2007 10:46:19 PM
nice circuit, works as described but i'm having trouble locating a good electret -> shouldn't one from a headset be acceptable? it only seems to pick up loud taps on the mic re stereo jack/active input questions: could this transmitter accept an active signal from a preamp, stereo, etc w/ or w/o modifications? thank you!
anonymous
FM Transmitter
Saturday, July 07, 2007 1:54:44 PM
the circuit is very simple and a simpler circuilt would be dificult to produce and the use of such a device is illegal (in england at least) and if you had a devce with a range of 20km it would probably be confiscate by ofcom or FCC. what would be good would be to have a directional antena which would direct the radio waves in the direction you want them to go and less away from your reciever. googleing anntena design may help you the wave length is ~ 2 metres
anonymous
FM Transmitter
Thursday, July 05, 2007 10:37:46 PM
where can you buy all components?
memo
FM Transmitter
Monday, July 02, 2007 4:26:17 AM
pls u can help me to construct 1 km range with very very senestive Mic.
anonymous
FM Transmitter
Sunday, July 01, 2007 11:41:49 PM
Is it Working...? Have any one of you tried this circuit... Plz Tell
Salvador Mison
FM Transmitter
Sunday, July 01, 2007 11:18:20 AM
hi! pls. send me a fm transmitter with 5km range. thanks. & mopre power to you. Jun
vishal
FM Transmitter
Saturday, June 30, 2007 9:12:36 AM
I Want to build Fm Transmitter Project in my city. I want to know about all setup, equipments,doccuments and all over cost.That is detail Project report FM Range is about 100KM.
adewale raji
FM Transmitter
Monday, June 25, 2007 9:46:42 AM
pls l will appreciate it if u can send me a more comprehensive circuit diagram and materials to design a 30km range fm transmitter. Thank you
Sapan
FM Transmitter
Sunday, June 24, 2007 1:45:56 AM
This is my Project and Thesis subjects. I Your Help. Please Help me to provide information about to Design GSM Transmitter and REceiver
Nandu
FM Transmitter
Friday, June 22, 2007 1:36:13 AM
can i get a some more simpler ckt
michael wilkins
FM Transmitter
Thursday, June 21, 2007 4:09:14 PM
where does it transmit the signal to?
osaitie Osayande
simple FM Transmitter construction
Thursday, June 21, 2007 10:42:08 AM
i would like to learn how to construct a simpler fm transmitter
Ali
Wireless Audio Transmitter
Wednesday, June 20, 2007 2:04:09 PM
Hello everyone,i m trying to make wireless audio tranmitter for my audio system.if anyone have any idea how to make it than plz help ill be very thankful to that persons.Cheers bbye
ariyo odebiri
FM Transmitter
Wednesday, June 20, 2007 7:11:11 AM
pls assist me on the components to use for construction of 20km range fm transmitter.you are the best!
kent
FM Transmitter
Tuesday, June 19, 2007 5:35:58 PM
Can a stero jack be subtuited for the mic? For a Ipod in my cat?
Virgo
FM Transmitter
Tuesday, June 19, 2007 6:54:20 AM
Looking forward to replace mic with Audio out from pc.
Virgo
FM Transmitter
Tuesday, June 19, 2007 6:50:05 AM
Thanks ......I am Electrical Engg.........Ckt is easy except I think Inductor's construction is critical
gadraj
FM Transmitter
Tuesday, June 19, 2007 5:47:32 AM
27 mhz transmiter & reciver ~4 watt ~25watt thanks ok
anonymous
FM Transmitter
Tuesday, June 19, 2007 2:31:12 AM
good
jamie
FM Transmitter
Tuesday, June 19, 2007 1:11:25 AM
i was crazy for fm transmitter
godson uchenna
FM Transmitter
Monday, June 18, 2007 6:04:21 PM
i want to know the work of fm transmitter in coden and bringing out sound from fm wireless microphone
manna
FM Transmitter
Monday, June 18, 2007 7:42:03 AM
Very Bad
susil kumar
FM Transmitter
Saturday, June 16, 2007 7:40:46 AM
In place of the mic can we use a NO type push button,so that we can transmit a pulse .
abedelazizyassine
FM Transmitter
Friday, June 15, 2007 3:22:26 PM
if i want to make this fm transmitter with a hi power to get more transmitter feet may you teel me all the thing about or to give me the shematic an the layout to this circuit?
Leandro
FM Transmitter
Friday, June 15, 2007 7:59:12 AM
Fm transmitter is illegal in a lot of countries...I prefer to use very low power transmitter.If you want I have a simple schematic project about radio remote control with inexpensive and famous component,without ferrite coil and with a simple air coil.I ll send it on e mail
Mark Harlod
FM Transmitter
Wednesday, June 13, 2007 1:29:44 PM
Thanks a lot! Will try it out!
anonymous
FM Transmitter
Thursday, June 07, 2007 5:09:23 AM
It is very exiting to constract simple FM transmiters. Please would you help me to constract an Fm transmitter with working radius of more than one kilometers?
anonymous
FM Transmitter
Wednesday, June 06, 2007 10:24:00 AM
just ampify this circuit's signal, and use a big antenna
ANITA SIDIAL
FM Transmitter
Wednesday, June 06, 2007 9:44:49 AM
hey i'm doing a project where i have to set up a FM transmitter on an 11 acres compound. The transmission should not interfere with signals out of the compound. The land has a building with a height of 38 feet. the width of the compound is 150 m, can i use the same low power transmitter. if not can u help me get one .
jami
FM Transmitter
Monday, June 04, 2007 12:31:14 AM
I need a circuit diagram of FM Transmitter having range abour 1Km min.
vergel
FM Transmitter
Sunday, June 03, 2007 9:11:46 PM
could anyone help us to give a block daigram sterrio fm transmitter could reach the highist ranges of 3kilo meters i construct fm transmiiter to swicth my 2 water pump by trigering one pump left chanel and right chanel is for the second pump transmit and received within 3km away. Thanks
jun
FM Transmitter
Saturday, June 02, 2007 4:24:28 PM
could you pls. help me construct an fm transmitter that could trigger a receiver within 5km range. I plan to use it for buglar alarm. The concept is like this once a buglar is detected it will trigger the transmitter to transmit to a receiver located 5km away. Thanks
Josh Dawkins
FM Transmitter
Saturday, June 02, 2007 3:22:37 PM
I would like to know how to build an FM transmitter with a range of about 5 miles. I have an antennae capable of outputing upto 50 watts of power, mounted at about 11 metres. If anyone can help, please send to me.
OKWOR SUNDAY UCHENNA
FM Transmitter
Friday, June 01, 2007 11:56:56 AM
THANK YOU FOR PUTTING THE DIAGRAM IN THE WEB.I NEED MORE SIMPLIFIED DIAGRAMS
sunnykal
FM Transmitter
Thursday, May 31, 2007 11:48:45 AM
is really goog to work on, ley me try an see if i can work it out. keep it up guy
arjay
FM Transmitter
Monday, May 28, 2007 1:55:16 AM
pls send to my email add for your reply....and i will send you the photos of my project if i will finish it....thanks god bless
arjay
FM Transmitter
Monday, May 28, 2007 1:51:56 AM
how much the volt of C1,C2,C3,C4 capasitor?.and what is the substitution of 5.6 pf capasitor and C5 3-18 ajustable cap?.adjustable cap and adjustable nub are they the same?
euge
FM Transmitter
Sunday, May 27, 2007 12:40:14 AM
Our group have tried your simple FM transmitter circuit diagram.It did work when we passed the project, thanks very much. Arigato.
anonymous
FM Transmitter
Saturday, May 26, 2007 9:10:17 AM
i will like a more detailed explanation, both theoretically and experimentally.
PSYCHOPATHiO
More power
Friday, May 25, 2007 6:50:21 PM
would it possibly go futher than 400 feet... I'm thinking a couple of miles??? I have a plane of starting a Pirate radio ;)
Bushra
FM Transmitter
Friday, May 25, 2007 6:00:40 AM
For mitshiru.......can you please email me the project photos you were talking about.....i want to do this as a project and need a lil help...ill be very thankful
Jeremiah Nyambane
FM Transmitter
Friday, May 25, 2007 3:23:45 AM
I would like to have some information and if possible a circuit on an FM transimitter that can be used to trigger an alarm incase of burglary.Please use the above email address.
David Y Musa
FM Transmitter
Thursday, May 24, 2007 8:31:28 AM
please, ineed more explanation and theory on fm transmitter if possible. i desire to work on it for my project if you can send but the complete circuit diagram and the theory for the success of my project.Please do use my mail box above.THANKS
Mitshiru
FM Transmitter
Monday, May 21, 2007 10:41:33 PM
EXCELENT!! We did 4 of this, and them works very well ! Arigatou!!! :D If u send me your email, I could send u the pics of the proyect, and the photos of the carrier frecuency of the transmision on the sprectrum analyzer. :D Arigatou! :D
anonymous
FM Transmitter
Sunday, May 20, 2007 3:47:19 PM
I was wondering if you could use an adjustable cap with 4-32 pf in order to increase the level of the frequency being transmitted.
kaushik
FM Transmitter
Sunday, May 20, 2007 8:18:28 AM
i want to to build FM transmitter circuit thats range is 1km, if anyone know then please send me by mail for FM Transmitter simple diagram pls send me my mail
jason
FM Transmitter
Friday, May 18, 2007 4:12:16 PM
Nice it worked well thank's!!!!!!!!!!
joe
FM Transmitter
Wednesday, May 16, 2007 2:13:30 PM
it work very well, i could make it work in 88 - 108 range thanks to the Adjustable Cap. When testing, would be usefull to have a spectrun analizer near to you to check out the frecuency (cause you can get lost). The only problem was the antenna. I tried with a long wire but every time y touched, the frecuency change
Jon
FM Transmitter
Wednesday, May 16, 2007 12:15:46 PM
Is it possible to make a FM transmitter for a IPOD? If so, how would one go about making one?
anonymous
FM Transmitter
Wednesday, May 16, 2007 6:11:34 AM
I am very interested in constructing Fm transmiter and other related circuits. Please, wwoud you help me to construct Fm transmitter with range of more than 3 k.meters?
anonymous
FM Transmitter
Saturday, May 12, 2007 11:46:05 AM
Please how much does it cost to own an fm radio station

(Editor's notes: A few million...)

cliff jairo
FM Transmitter
Saturday, May 12, 2007 6:55:56 AM
hi there my name is cliff jairo am like to know about high power transmiter mybe for 1000 km i beg you to bring to me the circut i hope i get the circut
anonymous
FM Transmitter
Friday, May 11, 2007 4:34:43 AM
I am a student in dhaka polytechnic institute in Electronics Technology.My fevarate hoby is FM band.So give me a full circuit in FM transmision and antina system.
shere
FM Transmitter
Wednesday, May 09, 2007 3:13:58 AM
how to the material to connect the digned
anonymous
FM Transmitter
Sunday, May 06, 2007 2:06:41 PM
dumb information

(Editor's notes: As useful as your comment.)

mukul
FM Transmitter
Sunday, May 06, 2007 9:38:22 AM
brief summary about project
Aviad
FM Transmitter
Tuesday, May 01, 2007 3:21:50 PM
Hi there I would like to built transmitter by my self I looking for stable and high quality oscillator that I can tune 0.2MHz between channels all FM range so I need synthesizer frequency which companet are you recomanded All regards Aviad
anonymous Rohit patel
FM Transmitter
Tuesday, May 01, 2007 2:48:37 AM
Sir,, really i like ur dream project..but sir i required 5 to 6 km range fm transmitter can u help me plz....
anonymous
FM Transmitter
Monday, April 30, 2007 12:01:07 AM
i made it but it doesnt work :P
kwesi
FM Transmitter
Saturday, April 21, 2007 2:04:30 PM
i like your work and i want to use it as my final project pls can i get more information.thanks
Himanshu Madheshiya
FM Transmitter
Saturday, April 21, 2007 4:23:51 AM
This circuit works well,but quality of sound is poor can u suggest any improvement?I cannot recognise spoken words on receiver,i can make out that something is being spoken but what is actually spoken its hard to guess
islam
FM Transmitter
Friday, April 20, 2007 6:49:38 PM
good for now but the real comment after it 's work
anonymous
FM Transmitter
Friday, April 20, 2007 4:59:50 PM
I built an FM Transmitter almost identical to this one. It oscillates and I can hear myself on the radio but it is very hard to tune the variable cap because it ranges from 5.5-80pF. Miller's Theorem is a tricky son of gun and can make you go crazy if you dont know how to calculate these values. Miller's theorem basically tells you that there is an internal capacitance between the nodes of the transistor and you have to calculate them to take them into account. If I take it inot account, my variable cap would have a smaller range, like 2-10pF, and it would be easier to tune the frequency. Some advice would be to open a book or search the internet before you just start building something, there is no value in building something you know nothing about. Otherwise you might as well buy it. And trust me you dont need to be a genius to figure any of this out. Hope this helps the ones who are confused.
GeekKing
FM Transmitter
Thursday, April 19, 2007 11:23:57 PM
Does this work on a radio?

(Editor's notes: Um, yes?)

syed sadiq ahmed.m
FM Transmitter
Tuesday, April 17, 2007 5:19:05 AM
this circuit really works
Isaac
internet radio
Monday, April 16, 2007 2:45:41 PM
Please can anyone tell the full meaning of TX and RX as used in internet radio
Passion
FM Transmitter
Monday, April 16, 2007 3:03:24 AM
help me telling the IC of fm traansmtter
GAURAV
FM Transmitter
Sunday, April 15, 2007 4:27:04 AM
VERY GOOD PROJECT
Rohan
FM Transmitter
Friday, April 13, 2007 5:55:33 AM
I made this FM transmitter ditto as given but it failed to work. Not even a bit. All I could hear in a FM receiver kept nearby was background noise, and some sound when i hit one of the capacitors or some other components. My teacher told me that it was due to keeping the components legs not touching the PCB and keeping the gaps shown in the fugure. She even suggested the use of some kind of op amp or some thing to boost the power of the circuit. Someone please help me to build a complete working model of such a FM transmitter. I don't want to loose out on quality to make the design simple and cheap.
anonymous
FM Transmitter LINKS
Wednesday, April 11, 2007 9:38:22 AM
my god! so many silly comments! for nice fm trasmitters have a look at anarchy.translocal.jp and fm.thing.net and http://www.electronic-circuits-diagrams.com/radioimages/radiockt1.shtml and http://tacashi.tripod.com/elctrncs/smplfmtr/smplfmtr.htm
akinwole bukola
FM Transmitter
Wednesday, April 11, 2007 4:54:41 AM
I WANT YOU TO GIVE ME THE BASIC EXPLANATION ON FM TRANSMITTER [from the input to the out of the cct]
akinwole bukola
FM Transmitter
Wednesday, April 11, 2007 4:50:17 AM
i appreciate ur work i want to incorporate IC on my cct .HELP
anonymous issye
FM Transmitter
Tuesday, April 10, 2007 12:49:09 PM
now iam testing small FM Transmitter its problems is frequncy variable whats the problem ?
jeremy
FM Transmitter
Monday, April 09, 2007 11:44:57 AM
i built it just like it said and it is not working for me. i can tell that it is broadcasting somthing but not what is going in the mic. does any one that has built this have any suggestions for me. i may have screwed up on L1 L2 and the antenna. how did you do those.
AcidRain
FM Transmitter
Monday, April 09, 2007 8:39:14 AM
nice, i like this little article, it will help me for making my own radio station.
NITHISH
FM Transmitter
Monday, April 09, 2007 6:26:31 AM
I HAVE AN FM TRANSMITTER OF 5KM RANGE OF COURSE I USED IT FOR MY SCHOOL EXHIBITION TWAS WONDERFUL. THANK YOU THIS WEBSITE FER GIVIN ME AN IDEA FOR WAT TO DO FER ME SCHOOL EXHIBITION THANK YOU VERY MUCH
lubna
FM Transmitter
Sunday, April 08, 2007 12:59:16 PM
how does the fm transmitter works if it has.T1 BC 458
Saravanan C S
FM Transmitter
Friday, April 06, 2007 4:26:44 PM
i just want to set up a large area( 5km ) coverage. how can i get the components. and pls give me some sugestions.. and pls tell me whre can i buy the components
ahmad sadat
FM Transmitter
Friday, April 06, 2007 11:35:49 AM
hi this me . this practical circuit thanks.
maor
FM Transmitter
Friday, April 06, 2007 6:22:03 AM
wow this thing is epic i just need to get the parts to make this. this is also good for pranks XD
SUROZOE
FM Transmitter
Thursday, April 05, 2007 1:22:12 PM
It's wonderfull, iam so happy cause this one of kit finally i found.
chikoti mulenga
FM Transmitter
Thursday, April 05, 2007 10:30:33 AM
its wonderful
santosh patil
FM Transmitter
Thursday, April 05, 2007 1:14:48 AM
I would like to thank you for giving us the deteiled and basic explaination about FM transmitter. Thanking You
ivan
FM Transmitter
Wednesday, April 04, 2007 10:41:26 PM
hello i want to know if that works and how
anonymous
FM Transmitter
Wednesday, April 04, 2007 8:15:51 PM
where can you by a 3-18pf Adjustable Cap
oywello george
FM Transmitter
Wednesday, April 04, 2007 8:47:51 AM
Sir, some components I can get them but getting 28AWG enamel coated margnet wire and Transistors 2N2222A npn, or 2N3904NT123A are diffcult. PC Board layout and parts placement are not clear.
Qais Ali
FM Transmitter
Wednesday, April 04, 2007 12:39:57 AM
I found ur circuit on this site and then i tried and found a well low range FM Transmitter but I wanna try to made a high range and hope that this will be much supportable for me as it had given me confidence and way of aproch thanks
michael
FM Transmitter
Tuesday, April 03, 2007 7:37:29 PM
where can you by a 3-18pf Adjustable Cap
Akonji
FM Transmitter
Tuesday, April 03, 2007 9:25:46 AM
I must commend your efforts.Please, can the transistors used in FM transmitter be replaced with IC.If yes,i would appreciated your assisstance on this. Regards, Akonji, PH, Nigeria.
Josh
900 mhz
Sunday, April 01, 2007 11:04:54 PM
HELLO I PUT THIS CIRCUIT THGETHER AND IT DID WORK!! I WAS JUST WONDERING IF YOU HAD ANY FOR 900 MHZ RADIO'S? i am 14 years old and i love electronics
venkatesh
FM Transmitter
Saturday, March 31, 2007 3:46:01 PM
I got all the components expect the variable capacitor.Where can Ipurchase that?if some other technique is avaliable means please tell me that. I am in hurry in completing that project.thank you tell me that soon
george atakpa
FM Transmitter
Saturday, March 31, 2007 3:39:03 PM
i want to know the functions of the components in the circuit for fm transmitter.
Joseph Sekiku
FM Tantenna transmitter
Saturday, March 31, 2007 6:31:26 AM
I have built a small transmitter. now I want to build a corresponding antenna for transmission. Tell me how. I am in Tanzania
manzoor ahmad
FM Transmitter
Saturday, March 31, 2007 1:25:22 AM
salam the given circuit is very impressive. i need the thesis on this project that how it works. thanks
mayank agarwal
FM Transmitter
Thursday, March 29, 2007 4:28:36 PM
sir, i make this ckt but this ckt could not work .at which frequency we receive this signal.
deepthi
FM Transmitter
Thursday, March 29, 2007 1:18:34 AM
sir i have read you project i tried to do it but i can not get the variable capacitor c5 mentioned in the list please teel me where i can get ths or any substitute.iWANT TO DO THE PROJECT AND REALLY WANT TO SEE HOW IT WORKS.SO PLZ ASSIST ME.thank u
anonymous
FM Transmitter
Wednesday, March 28, 2007 3:28:29 AM
i want the parts required to do a fm transmitter
Akram khan
FM Transmitter
Tuesday, March 27, 2007 3:42:11 AM
hello sir give me the the transmiter in block diagram form
kdz
FM Transmitter
Monday, March 26, 2007 12:55:57 PM
I also want to be able to pick up the frequencies from your transmittor. How do I go about doing that? Can I make a reciever, or can I just go out and buy one? Thanks
Chetan Hegde
FM Transmitter
Monday, March 26, 2007 11:28:49 AM
i want to build a FM transmitter which is capable of receiving the audio frequency of any FM radio station.
barau yusuf
please i need an fm transmitter circuit that can cover a distance of 2-3km can you help me please
Monday, March 26, 2007 9:50:49 AM
thank you for your assistance
matthew
FM Transmitter
Monday, March 26, 2007 8:21:20 AM
hey, i need a circuit layout for a FM transmitter for no more than 500m. Also needs to have a input to be able to transmit music and other audio, i run a school Radio station and want to go FM. Please help me. or if you have any ideas please tell me as i want something no more than 500m tops.....
YESSI
FM Transmitter
Sunday, March 25, 2007 3:25:37 AM
I need to make very small but high range FM transmiter. In spy project so i need help from someone....
anonymous
FM Transmitter
Saturday, March 24, 2007 4:26:25 AM
this is only used in radio? may I use in computer
latebloomer
FM Transmitter
Friday, March 23, 2007 7:17:15 PM
I am just getting into "rolling my own" electronics for robotics. I like the easy to digest fomat of your instructionals. I have through self research, learned much about electronics but in the course of doing so would find a part of a concept impossible to understand which would sometimes keep me from understanding it's other dependent parts. I just started reading the article in "howstuffworks" and find they fill in the gaps whether it's a research paper of a schematic. Thanks! Oh and P.S- to those lazy readers who want people to send them copies of special designs to their Email addresses-- HIRE A CONSULTANT!
MEHUL
FM Transmitter
Thursday, March 22, 2007 6:39:00 AM
POOR outout power,less range
anonymous
FM Transmitter
Thursday, March 22, 2007 3:30:08 AM
I want to build a transmitter that can transmit at cell phone frequency range(900 Mhz).Kindly help me with that
eche
FM Transmitter
Wednesday, March 21, 2007 9:13:44 PM
i want to build an fm transmitter for my project can u pls send me materials
anonymous Olak
FM Transmitter
Wednesday, March 21, 2007 11:44:02 AM
i wanted to construct an FM transmitter, and a receiver that can work effectively over a distance not less than 1km. frequency range 88-108MHZ. can you please avail me with some circuits. thanks
anonymous
FM Transmitter
Tuesday, March 20, 2007 6:06:24 AM
i got a information how to produce ur own radio station
alejandro
FM Transmitter
Sunday, March 18, 2007 6:30:51 PM
i need to built an fm trasmitter for a range to about 1.500 feet can can u assit me whit this
nike
FM Transmitter
Sunday, March 18, 2007 4:10:38 AM
pls give a reference of FM station proposed design
Saleh Shames
FM Transmitter
Saturday, March 17, 2007 10:39:41 AM
Hello sir i am the student of Electronics technology sir i want to recive by my E.mail Adress the new diagrams i have made this projects thank it is working very well!!
anonymous
FM Transmitter
Friday, March 16, 2007 5:50:55 AM
i need a trasmitter that can go way atleast 20miles...Tunde
Titus
FM Transmitter
Friday, March 16, 2007 3:37:44 AM
i want to built an FM trasmitter and a receiver for my project.can u assist me in the FM receiver part?
stalin
spy circuit
Thursday, March 15, 2007 8:27:20 AM
this circuit must work with 3v ,this should record speach
anonymous
FM Transmitter
Thursday, March 15, 2007 8:16:40 AM
Pls, i want to construct an FM Transmitter for my project how can you assist me with materials and circuit diagram. Regards,
Asad
FM Transmitter
Thursday, March 15, 2007 4:54:32 AM
let me check its work. but what about a receive... is it a normal radio set ???? pls reply
Adedipe Yinka Adedapo
FM Transmitter
Wednesday, March 14, 2007 6:44:20 AM
Thanks for giving me a clue to my problem.
cynic
radio amplifier
Tuesday, March 13, 2007 11:18:37 PM
i want to built one
vikash
FM Transmitter
Tuesday, March 13, 2007 3:34:30 PM
sir i want to create a small fm station.can u send me the data and picture of that
siyabulela
FM Transmitter
Tuesday, March 13, 2007 11:26:15 AM
i want to incease the transmitter supply of 9v to use 12v,so how can i do to meet the requiments of it or to extend it.
ankur
FM Transmitter
Monday, March 12, 2007 6:46:11 AM
it's too bad it doesn't work

(Editor's notes: Yes it does.)

EDISON
FM Transmitter
Monday, March 12, 2007 4:13:48 AM
when we made our fm trasmmiter, we able to get two frequencies...how can we overcome this image frequencies....trhankzzzzzzzzzz
Dennis
FM Reciever
Sunday, March 11, 2007 8:44:02 PM
Sir am a student, Can u please kindly send me a diagram for a reciever that I can build to recieve the transmission of this FM Transmitter thanks.
OKOJIE A CHRISTOPHER
FM Transmitter
Sunday, March 11, 2007 4:46:24 PM
The analysis about the FM transmitter is quite cool. But how can I increase the range over 400 with 12V power or less?
arif
FM Transmitter
Sunday, March 11, 2007 7:36:52 AM
pls anyone have FM Transmitter simple diagram pls send me my mail
Ayo
FM Transmitter
Saturday, March 10, 2007 6:02:48 AM
I love this. Can you kindly send the circuit into my box and also a report on how a transmitter works.
Junaid
FM Transmitter 80w circuit and diagram(2) Esey Cw High Rang Sw Trasmitter Circuit And Diagram Esey Coll Sistam And Jap Transitors.Thank.
Thursday, March 08, 2007 12:00:52 PM
Sir I am student.my hobby Trasmitter Making Pls This Circuit and diagram p....ed Dightal Am.Fm Cw Trasmitter Esey Coll And Japaney Transitors Sand me. Thanks.
Rotimi
FM Transmitter
Wednesday, March 07, 2007 12:49:27 PM
Not lookin bad, i have to test it to check if it works!!! Looks cool
ibrahim
FM Transmitter
Wednesday, March 07, 2007 8:29:38 AM
Please send me the circuit diagram of 80watt FM transmitter.
noneofyourbeeswax
FM Transmitter
Tuesday, March 06, 2007 5:40:33 PM
Haven't tried it yet,but it looks REALLY COOL!!
mahesh
FM Transmitter
Tuesday, March 06, 2007 5:52:50 AM
excellent
HARI
FM Transmitter
Monday, March 05, 2007 7:23:23 AM
EXCELLENT
elec
FM Transmitter
Sunday, March 04, 2007 12:10:45 PM
can anyone tell me the function of the transistors in the circuit???... tnx.
john piple
FM Transmitter
Sunday, March 04, 2007 2:13:53 AM
this is very ba d circuit
ISMAIL
FM Transmitter
Friday, March 02, 2007 11:15:46 PM
INSTEAD OF C2 CAN WE USE SOME OTHER CAPACITOR
lowlife
FM Transmitter
Friday, March 02, 2007 6:05:26 PM
This circut is the best! My friend and I were unhappy because I forgot the book with directions for the circut. I looked here and I immeditly and found a diagram.
KiDa
FM Transmitter
Friday, March 02, 2007 1:19:58 AM
Can this circuit work to electric gutar?
burger
FM Transmitter
Thursday, March 01, 2007 3:02:27 PM
How should it be done to be in stereo?

(Editor's notes: Can't be done with this circuit. Well, not easily anyway.)

Ibrahim
FM Transmitter
Thursday, March 01, 2007 3:39:40 AM
I have designed that circuit of yours and it doesn't work. Can you tell me why it is so?

(Editor's notes: Post your question on the forum. Could be anything.)

gurpreet
FM Transmitter
Wednesday, February 28, 2007 1:51:25 PM
i think use of this ckt should be elaborated a bit in context with remote control toys. how fixed frequencies are transmitted by press of diff buttons. mic of no use there. plz reply

(Editor's notes: That would be an entirely different circuit, must more complicated. This transmitter is a simple transmitter used to transmit audio only.)

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