Power Supply


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When working with electronics, you always need one basic thing; power. This power supply is great for powering all kinds of electronic projects. It produces a well filtered, variable 1.2-30 volts at 5 amps. It is easy to build and the parts are realitively easy to find.

Schematic

This is a schematic of the Power Supply

Parts

Part
Total Qty.
Description
Substitutions
C1114000uF or 10000uf 40 VDC Electrolytic Capacitor
C21100uF 50Vdc Electrolytic Capacitor
C310.1uF Disc Capacitor
C410.01uF Disc Capacitor
R115K Pot
R21240 Ohm 1/4 W ResistorSee Notes
U11LM338K 1.2 to 30 Volt 5 Amp Regulator
BR1110 Amp 50 PIV Bridge Rectifier
T1124 V 5 Amp Transformer
S11SPST Toggle Switch
MISC1Wire, Line Cord, Case, Binding Posts (for output)

Notes

  1. The regulator comes in a TO-3 case and MUST be used with a LARGE heatsink. You may want to mount a small fan to blow air across the regulator (I did).
  2. The filter capacitor is large. It won't fit on any board so bolt it to the case.
  3. You can, of course, add a volt and amp meter.
  4. Since this project operates from 120 VAC, you must include a fuse and build the project in a case.
  5. R2 may need to be decreased to 120 Ohm if you experience voltage drift at light loads. 240 Ohm may not load the output appropriately on some regulators. The datasheet for the LM338K does specify 120 Ohm (I suggest you use a 1/2W unit) so you may just want to use 120 Ohm and not bother with the 240 Ohm resistor showin the parts list. This has been discussed on the forum.

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Comments

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anonymous
Power Supply
Tuesday, January 20, 2015 5:43:46 AM
can i used 24 v 10 amp transformer with this circuit.
Hassam Balouch
Power Supply
Tuesday, November 12, 2013 11:37:31 AM
I have made this successfully but i did some changes by using LM350T volt Regulator and 10k pot .
GNM
Power Supply
Thursday, June 27, 2013 11:29:09 PM
Hello again. I commented on this LM338K-based power supply. back in 2008 when I built a dual version for my G-Scale Model Railroad. It's still working great with no problems! It's great circuit. It's very stable and easily puts out 5 amps at up to 30 volts. The amperage has been checked with a DC clamp meter and suitable dummy load. Thanks again. I really like your website here, too. Regards.
Jason Timbrook
Power Supply
Monday, February 27, 2012 1:12:09 AM
Hello, I've never wired up anything, but as a working tattoo artist, have run across the need to. What I am looking to build is a power supply with a 3 way toggle that could run 3 separate tattoo machines, one at a time. Preferably 0-18v @ 2a. Could someone please help me come up with a parts list and wiring diagram for something like this? It would be much appreciated. Thanks in advance!
smit
Power Supply
Monday, August 01, 2011 8:48:32 AM
I want to build a power suplly inwhich 220voltage (vac) is used and variable voltage 0-----30 volts will outper(DC) and the minimum output current is 1 amp Please help me to bulid this circuit diagram I WILL BE VERY THANKFUL TO YOU.
Daniel
Power Supply
Tuesday, March 01, 2011 8:55:09 AM
I have given up trying to locate a 24V 5A transformer. they do not exist. the one with the lowest amps I can find is a 10 amp. will that be ok?
anonymous
Power Supply
Friday, December 10, 2010 5:33:46 AM
R2 gets super hot, and the pot get in fire. These 2 resistors are connected from the positive to the negative rails, WHY? It burns the resistor across the rails. I am sure this circuit diagram is right, as I saw it from many difference places, but why the pot burned? I am sure I have a right setup.
Adam Kellerson
Power Supply
Sunday, June 20, 2010 6:55:42 PM
More a curiosity question than anything. The LM338 schematic shows an input voltage of greater than 28V while you have a transformer outputting 24v spec'd out. (assuming 120Vac input) ?
Tom
Power Supply
Sunday, February 14, 2010 11:47:34 PM
I have a couple 13.8 vdc power supplies that were used for ham radio; I'd like to build an aux. project box to use as a 1.2 to 12 vdc, 5A Variable Power Supply. If I include everything to the right of the bridge rectifier in the above circuit, am I on the right track? ... Thank you very much for your reply!
Mike Tanner
Power Supply
Wednesday, January 20, 2010 6:12:41 AM
Hi Aarron What pin on the 2n3005 is the IN, OUT and ADJ. The data sheet for the 2n3055 does not give this kind of info. Am I to assume that the IN is the Collector, the OUT is the emitter, and the ADJ is the base. I have tried to wire this up but it is not working. I may have burn something up or have it wired up wrong. Thanks Mike
ilyas
Power Supply
Tuesday, September 15, 2009 8:05:30 AM
i cant find the exact valued elements for this circuit and pruchased a 24 V, 3Ampere transformer, 270 Ohm, 4.7 K Pot, 100uF 63Vdc Electrolytic Capacitor, 8200 uf 50 VDC Electrolytic Capacitor. actually i want 3 ampee cureent and variable 2 to 20 volts. with these element what output is expected ? Sir, please tell me ASAP.
peterlonz
Power Supply
Friday, September 04, 2009 12:55:33 AM
Nice but based on fairly costly linear regulator. With variable output power supplies it's important to easily get the output regulated voltage that you need at any particular time. My thoughts on this is either: 1) Permanently hook up a cheap digi multimeter so that setting the output is easy & accurate, or 2) Building in a panel digi voltmeter. I'd prefer this but do not have access to a low cost design. Can anyone help here
George
Power Supply
Wednesday, July 22, 2009 12:38:39 AM
Looking to build a power supply for a foam hot wire cutter, wire will be 12 to 36 inchs long depending on project. Would this power supply work for this? I would like to have 24 v and anywhere from 5 to 10 amps, so that is what caught my attention to this power supply. Thanks Great site.

(Editor's notes: No.)

anonymous
Power Supply
Sunday, July 19, 2009 11:22:18 PM
Nonsence. This will not supply 5 amps with a Voltage differential from input to output of 30 Volts. At 30 Volts between input and output and 5 amps out you will be dissipation 150 Watts in the device and it will go into shutdown. It can only supply one amp when Voltage between input and output is 30 Volts. See data sheet page three at bottom. Sorry about that

(Editor's notes: Not true. I've used this very supply for years. No issues dumping 5A into a 24V battery.)

babu
Power Supply
Tuesday, July 14, 2009 12:38:50 AM
sir good morning. i want to know basics of power supply how it works? i don't have any idea about it so please send me some materials of power supplies basics, types of power supplies,applications. in net everything is available but it is vast and unable to understand practically.so please help me as soon as possible .its very urgent.
Twan
Power Supply
Friday, July 10, 2009 5:22:04 PM
I have been searching for a design that has a 120 vac input and a 30 vdc output @ 15 amps. Have you designed anything like that so far? If not, I would appreciate any advice if not your own design. THANKS
RLC
Power Supply
Saturday, April 25, 2009 1:59:14 AM
hi sir it's good power supply ckt, but i don't want to use transformer so please send me ckt that should not contain transformer but do the same operation as this ckt do.

(Editor's notes: You need a transformer.)

anonymous
inveter - frequency (for computers)
Monday, April 20, 2009 9:59:49 PM
hi....Good day!!! do you have an schematic of an inverter frequency, and it's article of the matter..i needed it on my project in school...or do you know how to increase the frequency of a power supply from 50hz or 60Hz in a computer....thanks for responding...i highly appreciated for your response...God Bless....just email me...thanks
anonymous Ken
Power Supply 12 VOLT 4 AMP
Sunday, April 12, 2009 3:56:08 AM
This is for a Princeton Graphics 17" LCD flat screen monitor. I am electricity challenged and have no clue about using more or less...etc. Can either voltage of amp requirements be lowered or lessen safely and still function correctly? In other words, could I use a 12 volt 2 amp or 300 ma as a brief substituite?
faizan
Power Supply
Tuesday, March 17, 2009 11:38:47 PM
Hello! i need the circuit of a power supply having output from 0 to 12 DCvolts. Its better that it is made up without using any IC,if not possible then send me the circuit with IC, and i want its full woking and description. Plz mail me as soon as possible its very urgent plzzzzzzzzzzzzzzzz!
michael
Power Supply
Thursday, February 26, 2009 12:47:48 PM
i need the scematics for a regulator circuit that can be used to reduce the output of 2 3vdc batteries in parrallel. this is to be used to reduce the rotation speed of a small dc electric motor
Lalo
Power Supply
Wednesday, February 04, 2009 9:01:16 AM
I am working on a friends Tattoo gun power supply , very similiar to the one here but uses 2 regulators LM338K and a LM350k , my question is why the 2 regulators I think the guns don't draw more than 3 amps , he did a 5 hour Tattoo and it crapped out , looks like a resistor is burned out could you show me a diagram of how you would hook up dual regulators like the one I am working on ? Thank you in advance ... Lalo...:-)
charlot
transformer
Friday, January 30, 2009 3:21:52 AM
Hi! My instructor told us about our requirements this final examination, that we are going to design 5-amp, 12v-0-12v step down transformer. i had no idea about the computation of the said transformer...pls help me or give me some idea on how to compute that transformer...hoping for your kind response... thank you and more power!!
Almas Mirza
Power Supply with positive common of 0 to 70 volt 2 amp out put
Friday, December 05, 2008 9:31:34 AM
Hello I need Power Supply with positive common of 0 to 70 volt 2 amp out put . Please mail me if you have this
anonymous
Power Supply
Saturday, November 29, 2008 3:23:27 AM
thts a really cool circuit i really get sucess in the projec will u tell me the formulas relating the dc power supply construction
kinneth
Power Supply
Saturday, October 25, 2008 1:46:31 AM
why is it the power supply connect to the12volts positive and negative? why is it the output of power supply of 6amps is 15volts?
eric indimuli
7 day programmable bell schmatic diagram
Tuesday, October 14, 2008 11:25:14 AM
i am very pleased with the site
anonymous
Power Supply
Monday, October 06, 2008 8:56:54 PM
Hello. I appreciate your posting this design. A couple of years ago, I needed a power supply for my "G" Scale model railroad. 5 amps was more than sufficient. Since I don't havve electronic controls on my RR, I use blocks which implies that I would need at least two power packs. The model shop wanted about $400 for a dual setup so I decided to buld my own. I built two of the power supplies into one case. I used some ceramic heat sinks for the LM338K units and so far, they have not even seemed to get warm so I don't uise a fan. I just cut several 2" holes in the case and covered them with wire mesh to ventilate the units. That did the trick. The two supplies were built into a metal electrical box that is 12 X 8 X 4. I added a panel voltmeter and ammeter on eqch side with two large knobs for contorlling the 5K pots..I also have a fixed 12 VDC tap with a switch and a red LED on each side and on the fixed voltage switch to show when the power is on. The only issue that I ran into was the lower voltage. With 1.2 VDC on the minimum setting, the locomotives would tend do crawl when the power was turned on. I cured this with some large ceramic resistors across the outputs in each supply to lower the voltage to zero. They are outside of the case in the back. It's crude but it works and they hardly get warm. The units have bene working flawlessly ever since I finished it. Thanks again!
kelly
Power Supply
Thursday, September 18, 2008 4:36:48 AM
hi..i want to design a circuit of output110Vdc where the input ia 240Vac..can u send me the schematic
need_help_for_my_project
Power Supply (0-12V and 1A)
Monday, September 15, 2008 6:57:57 PM
Can i ask for a favor m8? Can u send me the schematic diagram of a variable power supply with an output of 0-12V and 1A? I need it for our final project in school.. Thanks lot! Hoping for a positive response..;) By d way,the circuit above is great!
John Z
Power Supply
Saturday, September 06, 2008 11:40:51 PM
In note #1. at the end where you said I did, at first glance it looked like IDIOT ... LOL just a good laugh!
anonymous solomon
Power Supply 1.2 - 30 volts 5 amps adaptor.
Wednesday, August 06, 2008 12:46:52 PM
i trying to construct 1.2 -30 volts 5 amps power supply adaptor i need a substitution for 0.01uf disc capacitor
Vojtek
Power Supply
Tuesday, August 05, 2008 3:29:32 PM
Hi there, i was wondering if i can make an power supply which can produce 400VA with +/- 18V on Output. I was searching for an toroidal transformer but that version is more expensive and difficult to find. Please I'm waiting for your answer.
anonymous
Power Supply
Friday, July 04, 2008 10:08:09 AM
can you display the formulas you to find the values of the components in the power supply circiuts?
jon jon
Dual output Power Supply +- 15 volts ( not more than 15 components)
Friday, June 13, 2008 7:28:13 AM
hello there (: could you help me find a dual output power supply +-15 volts schematics and name the different sub-sections that makeup the dc power supply .Also components are restricted to 15 kinds and not more than 16 ! equal or less than 15 (: Please and thank you (:

(Editor's notes: Try the "related circuits" section.)

Tobby
Power Supply
Monday, May 19, 2008 8:01:39 AM
hi am trying to design abattery charger i need a substitution for a transistor BRX49SCR
anonymous
Power Supply
Wednesday, April 30, 2008 7:51:27 AM
Please help me design a power supply that has a voltage range from 0-20 volts and a max current supply of 2 amps, ripple voltage at full load must be 10mVpp and max voltage drop of less than 2 volts at full load. When current is limited be indicated by an LED, a short circuit protection provided and LED indicating when power supply is off/on & 12 volts battery charger with a charging voltage of 13.7 volts and max. current of 2 amps, trickle charging at 11.9 volts. Battery charger must switch off when it is fully charged at 12.5 volts. 3 LEDs must indicate the charging process, tricle charging and when battery is full.
anonymous
Power Supply
Monday, April 28, 2008 2:25:09 PM
Is it possible to use the LM338T ???
hussain
Power Supply
Sunday, April 27, 2008 1:05:27 AM
it's great design and i will use it at my lab but i need varible current the current in this circuit is fixed at 5 amp. what should i have to get varible current??
john
Power Supply
Wednesday, April 23, 2008 10:42:39 PM
please send me a circuit diagrame of regulated power supply that gives 0-30V and 3A current and also with details of components. The maximum voltage drop is 0.5V..please help me..thank you
grego
Power Supply
Saturday, April 19, 2008 2:55:05 AM
I have a couple of 6 amp 13.8 volt DC powersupplies that i would like to turn into variable voltage powersupplies. I will want the high amps even at low voltage. I appreciate any knowledgeable input thank you grego
TUNDE
Power Supply
Thursday, April 17, 2008 3:24:32 PM
please send me a circuit diagrame of power supply that gives 0-30V and 1A current and also with details of components
aLonE
Power Supply
Saturday, April 12, 2008 12:25:38 AM
Hello Sir/Madam, i am new in this things and a lot of things i didn't knew about it. Can you send me a dual output power supply for 240VAC input to 12V and 9V diagram. thank you....
anonymous David
Power Supply
Saturday, April 05, 2008 3:59:19 PM
I know this is simple, but I have not found it. On the ICs like LM317 how do you tell one lead from the other. thanks
Emeg
Power Supply
Saturday, March 29, 2008 3:17:27 PM
pls i help me design a power supply. specification. 10-12v voltage, and 700mA. need it urgent pls
adman
Power Supply
Sunday, March 16, 2008 5:36:15 AM
just get a 7805 voltage regulator, use a small heatsink, it can get hot without heatsink, pin 1 on left is input is where u put 12v + to, middle to - of 12v suply, last pin is 5v
anonymous
Power Supply
Sunday, March 16, 2008 5:29:50 AM
Desigh a 12 volts battery charger with cut out when the battery is fully charged.power supply must have a voltage range of 0 to 20 volts and maximum current supply of 2 amperes. a ripple voltage of 10 milli volts peak to peak .
Shane
Power Supply
Friday, March 14, 2008 9:20:20 AM
please help to design a pwer supply ranging 0 - 20 volts, maximum current of 2A, ripple voltage at full load is 10mVp-p and a battery charger 12volts have a charging voltage at 13.7volts, maximum curent a t 2A, trickle charging cross over at 11.9V, short circuit protection as well as 3 LEDs indicating the charging process, the trickle chaging and when the battery is fully, charger automatically switch off when battery charger is fully charged at 12.5V
muddasar
Power Supply
Thursday, March 13, 2008 2:51:46 AM
i want a variable power supply circuit that gives output of 0-30V 1A with complete details of components
muddasar
Power Supply
Thursday, March 13, 2008 2:08:46 AM
please send me a circuit diagrame of power supply that gives 0-30V and 1A current and also with details of components
anonymous
Power Supply
Wednesday, March 12, 2008 9:36:47 PM
An old ATX power supply is usually something everyone has lying around and works great for powering an embedded system or 12V battery application that is under development. Just short the enable pin and use a LM317 to regulate your current/voltage.
RONALD
Power Supply
Wednesday, March 12, 2008 7:59:38 PM
Please help me to design adjustable variable power supply 0-25v.thanks...
syed nawaid alam
Power Supply
Monday, March 10, 2008 5:11:27 AM
I want to build a power suplly inwhich 220voltage (vac) is used and variable voltage 0-----30 volts will outper(DC) and the minimum output current is 1 amp Please help me to bulid this circuit diagram I WILL BE VERY THANKFUL TO YOU.
kayla
Power Supply
Thursday, March 06, 2008 8:55:10 AM
i need 7805 voltage regulator . if you know enything please contact me !!!!!!!!!!!!!!
kayla
Power Supply
Thursday, March 06, 2008 8:37:09 AM
this is a cool website i hope this will help everyone i love to look at new websites and check them out so i will be back soon.
necromex
digital power supply
Thursday, March 06, 2008 7:29:52 AM
im making a power supply that displays the output voltage 3V, 6V, 9V, 12V respectively. but im not able to make the circuit for the double 7segment display. can someone please help me with this. and also the components in making the lcd display
shadrackm
Power Supply
Sunday, March 02, 2008 6:24:56 AM
please help to design a pwer supply ranging 0 - 20 volts, maximum current of 2A, ripple voltage at full load is 10mVp-p and a battery charger 12volts have a charging voltage at 13.7volts, maximum curent a t 2A, trickle charging cross over at 11.9V, short circuit protection as well as 3 LEDs indicating the charging process, the trickle chaging and when the battery is fully, charger automatically switch off when battery charger is fully charged at 12.5V
nana
Power Supply
Friday, February 29, 2008 10:28:49 PM
if the power supply didn't work, how did to overcome this problem?
presh
Power Supply and battery charger
Monday, February 18, 2008 1:36:13 AM
please help to design a pwer supply ranging 0 - 20 volts, maximum current of 2A, ripple voltage at full load is 10mVp-p and a battery charger 12volts have a charging voltage at 13.7volts, maximum curent a t 2A, trickle charging cross over at 11.9V, short circuit protection as well as 3 LEDs indicating the charging process, the trickle chaging and when the battery is fully, charger automatically switch off when battery charger is fully charged at 12.5V
paulluap
Power Supply
Sunday, February 17, 2008 6:36:57 AM
Hi, Can any of you guys help me with a project. Im supposed to design a Power supply with 1A and an output of 0 to 12-15V. From a 220V input. Oh and i cant use a IC Regulator. Is that possible? Thanks so much..
Joe
Power Supply
Saturday, February 09, 2008 12:26:23 PM
I think relatively is spelt incorrectly ;)
gomes
battery charger
Wednesday, February 06, 2008 10:48:55 AM
hi, i want to design 12 Volt battery charger with charging voltage of 13.7volts maximum charging current of 2A. It must automatically switch off when the battery is full. Short circuit protection with 3 LED's indicating charging process, tricle charging and when battery is full.please help me with any circuit diagram
Jonas
Power Supply
Tuesday, February 05, 2008 9:54:43 AM
I'm looking for a 2A intelligent 12V battery charger with cut out when the battery is fully charged.The battery charger must have a charging voltage of 13.7V and maximum current of 2A.The Trickle charging cross over must be at 11.9V.a short circuit protection must be provided as well as 3 LED's indicating charging process,trickle charging and when the battery is full.A power supply must have 0-20V and max current of 2A.The ripple voltage at full load must be 10mVp-p.Current limiting must be available to limit the current output.When the current is limited,it should be indicated by a LED.A short circuit protection must be provided as well as the LED indicating when the power supply is off/on.provision must be made for a display.
TJ
Battery charger
Wednesday, January 30, 2008 2:43:47 AM
12 Volt battery charger with charging voltage of 13.7volts maximum charging current of 2A. It must automatically switch off when the battery is full. Short circuit protection with 3 LED's indicating charging process, tricle charging and when battery is full.
TJ
Power Supply
Wednesday, January 30, 2008 2:30:04 AM
I want to design a 2A intelligent 12 volts battery charger with cut out when battery is fully charged. The power supply must range from 0 to 20V, with current limit at the output. The battery charger must indicate with 3 LED's, indicating the charging process, the trickle charging and when the battery is full.
anonymous
Power Supply
Saturday, January 26, 2008 4:17:41 AM
just get a 7805 voltage regulator, use a small heatsink, it can get hot without heatsink, pin 1 on left is input is where u put 12v + to, middle to - of 12v suply, last pin is 5v
jhayne
Power Supply
Thursday, January 17, 2008 12:30:24 AM
can u give me a design of dc power supply with a 12 volts of power supply.output is +5
M.Dutta
Power Supply
Tuesday, January 08, 2008 12:03:32 PM
I need a power supply : Input 12 V , Output +5,0 and +5,0,-5 with 1 amps current, stable up to .01mv.
Tim
Power Supply
Saturday, January 05, 2008 1:32:51 PM
Hi, great, it works! Does anyone know if I can add an adjustment for current also? Would it be simple? Thanks, TIm
karla cruz
Power Supply
Wednesday, January 02, 2008 9:05:35 PM
do you have a circuit which reads 30v/-30v?
anonymous
Power Supply
Friday, December 28, 2007 3:16:35 AM
hi need ur help for this. dual output dc power supply(output +15v and -15v) of not more than 15 components,scematic diagram and explaination how it works thanks alot
Doctor Electrik
Power To The People!
Saturday, December 22, 2007 5:11:55 PM
I presume few have an electrical background in here! Therefore, hints I share for the general public: I strongly recommend RESEARCH, RESEARCH, RESEARCH!For the transformer questions: Study amp-turns ratios and their properties, they're approximately proportional, however the current rating will be affected! Parallel and series? Parallel circuits all receive the same voltage, however each component, if containing resistance will contain a different current draw! Summing up for the total current in a parallel circuit would be adding each route's current back to the primary source! However, total resistance in a parallel circuit will be less than that of the smallest resistor...Strange, huh? Series? Different of that of the parallel circuits, each component containing resistance will receive a different amount of voltage (electromotive force), however, the current draw will be the same for each one since there is only one path for the power to be driven across!

I must go for now...See what you can look up on Ohm's Law, it helps a lot!

johnq
Power Supply
Friday, December 21, 2007 8:13:24 PM
can u gave me the schematic design of the power supply with universal cellular phone charger output and other connected charger that may used to connect to my power supply, or other device that may connect to my device..
Akram Khan Panhwar
Power Supply
Tuesday, December 18, 2007 4:47:45 AM
Hello Sir could u tell me please that i want to replace the ic (regulated) U1(LM338) to LM317 can i use this in my circuit of power supply And tell me the advantages and disanvantages to replacing this.
rakesh
Power Supply
Tuesday, December 18, 2007 4:04:05 AM
How to decide transformers secondary voltage to desine power supply ?
neil lourens
Power Supply
Monday, December 17, 2007 1:02:20 AM
I require a 220v/24VDC 15amp supply that goes into to trickle charge when reaching its full level, can anyone help.
sam
Power Supply
Sunday, December 16, 2007 12:49:15 AM
how can i build a 2 output power supply using only 1 transformer? the outputs should be 6V and 12V (using them at the same time).
lalit
Power Supply
Friday, December 14, 2007 1:33:33 PM
Respected sir, I want a circut who make 18 volt, 350 m.a (AC volt) from 220 volt (AC volt). (specialy low cost circut)Please help me. and send me circut by e-mail.
robert
Power Supply
Tuesday, December 11, 2007 4:30:58 PM
i want a schematic diagram of a full wave and half wave power supply
arvind
Power Supply
Tuesday, December 11, 2007 8:19:42 AM
I need a power supply with input 220V AC and output 12V,500mA
Saiful Anuar
Power Supply
Monday, December 10, 2007 9:36:54 PM
how do I design power supply -30V@15A?somebody please!!!!............anyone who have the info, please send to my email.thank you
demz
Power Supply
Monday, December 10, 2007 4:09:51 AM
can i ask for a schematic diagram of a split power supply of tda7240 stereo amplifier
Pablo Burgos
Power Supply
Sunday, December 09, 2007 2:44:08 PM
hi every1 i need a lot of help i need to do this thing for my class or im gonna fail the class i just need some info about Power Supply u know what they do and all the thing u ppl can tell me or any web site where i can found the info hope u can help me..thks
leighton
Power Supply
Tuesday, December 04, 2007 10:34:08 PM
i want to make a intruder alarm. as some one crosses the door, i would like to have some sort of a infrared sensor, to trigger the alarm, which wil sound like a door bell or a siren. i no how to make the sound and all. just having the infrared part confuses me. i dont no how it works., i would like for u to explain and mayby post a circuit thankx cheers!
yousef
Power Supply
Saturday, December 01, 2007 1:52:14 AM
its really nice finiding such a website ,,, i was wondering how to design a circuit regulated power supply 3-30 v @ 5 amp,,,?
Mike
Power Supply
Tuesday, November 27, 2007 11:07:15 PM
Ok... legitimate question, unlike all the others you have recieved... I am in the process of building this power supply. What is going to happen if i short circuit the output leads? Will it continue to supply full amperage and just heat up the wires/components? or will it instantly destroy my LM338 regulator? Also, can i run 2 LM338's in parallel to supply 10 amps? (assuming my transformer will supply 10A), Thanks!
priscilla
Power Supply
Friday, November 23, 2007 3:06:10 AM
Can i Ask f there's a perfect power Supply?? how can i make perfect the power suppl??
YASIR IQBAL
Automatic cutoff 24 volt dc charger
Thursday, November 22, 2007 4:14:21 PM
how will be the circuit if the input voltage is 220v and the out put is 24vDC ? after finish Battery (24 VOLT DC) fully charged charging is off please replay And also tell me the circuit IF input is 24 volt dc and output is 24 volt DC Automatic cut off after finish battery fully charged REGARDS SYED YASIR IQBAL PAKISTAN
A.Venkatesh
electronically regulated power supply circuit
Thursday, November 22, 2007 6:01:27 AM
I am very glad to see this type of website .It's very useful to me . i need the circuit of electronically regulated power supply.
Luis Martinez
Power Supply
Monday, November 19, 2007 2:19:30 PM
I need this power supply but I'm having trouble simulating it in Cadence what part do you use for the transformer.
ktOB
Power Supply
Monday, November 19, 2007 12:55:21 AM
i have 2 computer fans that have .44 amperes and have the pos and neg and ground cables but i need to hook these up to a normal wall outlet and was wondering what kind of powersupply or what parts i wud need to convert 2 fans to one plug in
nwoji nnadozie samuel
Power Supply
Saturday, November 17, 2007 9:42:33 AM
I luv the circuit diagram, its symbol specification and the description of the circuit. I wish this circuit is send to my email.
Sherihan
Power Supply
Saturday, November 10, 2007 6:03:03 AM
how will be the circuit if the input voltage is 220v and the out put is 18v ? please replay soon
rovill
Power Supply
Tuesday, November 06, 2007 7:08:24 AM
Could you please give me a step by step instruction or guide on how to assemble a dual power supply having an output of 15 volts that has a regulator in order to change the output voltage. tanx!... ^_^
anonymous
Power Supply
Monday, November 05, 2007 9:55:59 PM
how much current output do i need to run a typical car stereo head unit with approx. 20 watts per channel? can i build this power supply w/o R1 (5k ohm pot) and replace U1 (voltage regulator) for a 12v regulator (LM7812 for instance)?
shoaib
Power Supply
Monday, November 05, 2007 8:05:45 AM
im sow very happy that there was a website like this.
shadab
Power Supply
Thursday, November 01, 2007 10:05:50 AM
i need a dual polarity regulated dc power supply 0-15 volts.plz send me its circuit diagram and detailz.
harish
Power Supply
Friday, October 26, 2007 1:17:27 AM
i would like to now deep discription of the power supply of the thermal and coal system.pls send it discription and drawings.
ana
Power Supply
Wednesday, October 24, 2007 7:41:00 AM
the voltage rating of the above circuit is what i am looking for. however, i need a higher current rating than 5 A. how can i raise the current up to 10 A? thanks.
arselli
electronics(power supply)
Tuesday, October 23, 2007 1:25:33 AM
hmm.....nice!!
jungkiwenas
Power Supply
Saturday, October 20, 2007 8:10:37 AM
how to increase current output?, can i pararel with TIP 2955 in LM 317 thx regads
michael
split type power supply & regulator circuit
Tuesday, October 16, 2007 2:17:36 AM
i need a layouts of split type power supply & regulator circuit layouts and assemble
studious
Power Supply
Monday, October 15, 2007 10:07:03 PM
can i have a power supply diagram ranging from 12-15volts 6-9 amperes. for our two channel 100watts each audio amplifier. please... need it as soon as possible
anonymous
Power Supply
Monday, October 15, 2007 7:22:23 AM
Could you please show me step by step in order to determine the time taken for relay to operate off a 24V dc supply if the armature is pulled in when the curren reaches 60% of its maximum value. The resistance of the coil is 2K and the inductance is 20mH
Umesh
Power Supply
Sunday, October 14, 2007 1:00:54 PM
hi, i want to make power supply of 5v DC 10amp rating using pwm. input voltage range 90 to 220 vac thanku
ayush
Power Supply
Sunday, October 14, 2007 5:50:59 AM
what are the advantages of dual power supply....??? than single power supply....
sesugh hulugh
transformeless swithcmode power supply
Saturday, October 13, 2007 6:36:01 PM
need tthe circuit diagram of a transformerless, swithcmode power supply with output voltage of 24V DC and 5A
Aran Sander
Power Supply
Thursday, October 11, 2007 8:16:56 AM
pls post the computations of the said power supply please i need it thenx also the computations for the transformer pls
Tahmid
Power Supply
Thursday, October 11, 2007 3:34:26 AM
Can't I use an LM317 with a pass transistor for a 5 amp power supply?
bamisaiye
Power Supply
Wednesday, October 10, 2007 2:13:30 PM
i want 2 know how go abt d construction of d power supply schematic diagram above and alternative to lm338 regulator
tumi
short circuit protection on power supply
Wednesday, October 10, 2007 11:32:05 AM
want to add a short circuit protection on my supply, any ideas? my power supply is 220Vac-24Vdc 1A
anonymous
Power Supply
Wednesday, October 10, 2007 3:17:11 AM
What is the BOM (Bill of Material) of this power supply?
monticarl osiang
variable dc power supply
Wednesday, October 10, 2007 12:57:27 AM
plss help us how to build a variable dc power supply 3 to 12 volts and give us some layouts plss and we will wait for you concern thank you very much xoxo.
anonymous
Power Supply
Tuesday, October 09, 2007 8:28:23 AM
Hye i need to draw a 9V from the circuit througt an IC 7809 to supply my voltmeter.. where can i draw such voltage?? thanks, Belal
aging de guman
Power Supply
Monday, October 08, 2007 3:06:00 AM
Can you please send me a circuit to convert my 5 volts dc power of my computer to 3 volts DC. thank you and best regeards.
richard benedictos
Power Supply
Saturday, October 06, 2007 1:46:28 AM
please help me to constract a design for regulated power supply having an out put of 12 volts,,,we need to use 220 input tranformer having 2A current,,thanks...pls email me ASAP
lokesh
Power Supply
Thursday, October 04, 2007 12:32:36 PM
i have a 12-0-12 of 2amp transformer and i have to use it for the voltage regulation could you please insist the circuit for the connections with variable power supply diagram.
cara
Power Supply
Wednesday, October 03, 2007 9:36:01 PM
what are the 2 kinds of power supply?? the regulated and unregulated right?? so, what are the meaning of this two??
jasmin
Power Supply
Saturday, September 29, 2007 8:49:49 AM
CAN YOU GIVE ME the step-by step procedure of making a basic dc power supply...having a step down multi tapped transformer..thank you.just email me ok?
JKAISER
Power Supply
Wednesday, September 26, 2007 2:36:23 AM
please post the schematic diagram of 0 to 30 volt output power supply..
ericks
Power Supply
Saturday, September 22, 2007 8:13:06 PM
i has already power supply 0-20v dc and i want annotate output with 7 segment displays (3 digits). can u design pcb circuits with 7 segment displays(3 digits)for power supply 0-20v dc...email me plzz.....ty b4 =)
nasr
Power Supply
Wednesday, September 19, 2007 11:40:09 AM
can you give me a schematic diagram of power supply used in home computers.
anonymous
Power Supply
Tuesday, September 18, 2007 6:46:42 AM
please post the schematic diagram of 5 to 25 volt output power supply...
anonymous
Power Supply
Monday, September 17, 2007 9:18:45 AM
i just wnna know the techniques of making a power supply.. its our final exam....please email me at my address..im just a freshman student and i have no background at this stuff.. thank you
MAC ANTHONY TARE
Power Supply
Monday, September 17, 2007 5:19:51 AM
help me and give me pls a circuit of a 1 to 15 volts DC output power supply which has 220 v input and uses diode bridge and regulated...and also a ciruit of a digital voltmeter which is to be attach..thank you very much
SHETE BARVE
Power Supply
Sunday, September 16, 2007 8:16:32 AM
sir, we want design single power supply using following specifications. input-230V output voltage-12V output current-5A we need to use programmable regulator with proper step size.even let us know use of each &every component used in this required circuit and any other option for that components used.
MABILA SAKHI
Power Supply
Saturday, September 15, 2007 5:22:55 AM
Sir could u do to me a schematic circuit variable output 2-12v 8A ac and dc from 240v. in the circuit will have relay,inductor,transfomer, rotating switch, fius, diod, transistor, LED,capacitor, and BR.plz (Include thr introduction, discussion, result. How I can check the power supply if its work or not before I use the device without using digital multimeter
MABILA SAKHI
Computor Power Supply
Saturday, September 15, 2007 4:23:11 AM
Dear Sir /Madam. I would like to grow up in electronic divece and knowing a lot how it functioning. I would like to know a lot about the computor power supply, so could you please send to me information about the above mentioned motion. Thi will include the followings:(Introduction, body, results, histoy, conclusion, authors, results , the component, and the sample of the function computor power supply. I will be gratefully if I will get a repply as soon as you get this message Yourstrully Mabila SS
PANDYA PRATIK
Power Supply
Friday, September 14, 2007 12:07:22 AM
hi, i want to make power supply of 0 to 15v DC. so for that what thing i need to bye and can i implement it please could u tell me. bye
anonymous
Power Supply
Wednesday, September 12, 2007 3:40:42 AM
I need the regulating 3-16 output volt DC power supply ( 5 amp from input line AC 220-250 to 3-16 dc volt )
anonymous
Power Supply
Sunday, September 09, 2007 11:54:54 AM
hi to whom it may concern .. -----) I (---- can i have two briges conected ) I ( 240 V ac ) I ( 12 V ac ) I ( -----) I (---- to this type of transformer ? thenks in advance for help ..
anonymous
Power Supply
Sunday, September 09, 2007 3:58:26 AM
can you give me a schematic and block diagram of full wave power supply with potentiometer 5-25 volts output
wisani lesly
Power Supply
Wednesday, September 05, 2007 12:00:19 PM
how can i trace fault in my power supply.special in radio or tv
salam hasnain
dual power supply
Wednesday, September 05, 2007 9:26:24 AM
sir, I want to make a dual power supply circuit having 230 volt AC and output of (12 volt dc, 1.5 A) and (5 volt dc, 500 mA). please give me a circuit to assemble it.
shekhar
Power Supply
Tuesday, September 04, 2007 5:31:09 AM
I WANT 2 DESIGN A 5 V REGULATED SUPPLY USING LM 323K AND USING BRIDGE IC
anonymous
Power Supply
Monday, September 03, 2007 9:51:58 PM
I like to add panel meters to this project. The volt meter would be connected between out+ and Ground? How would i connect the amp meter? Tnx
anonymous
Power Supply
Sunday, September 02, 2007 5:52:48 PM
how can i make tattoo machine working without tattoo power supply, i mean another power ? please if there some idea, let me know
s.v chalapathi
Power Supply
Saturday, September 01, 2007 3:33:09 AM
hello sir, I am very happy to take your circuit and i have small doubt that how will we calculate the capacitor value could you send the calculation process of capacitor value. I asked so many people no one has the knowledge to calculate it. So you are my only hope please send the designing of capacitor value.I hope you will give the answer what i required. Thank you.
anonymous
Power Supply
Wednesday, August 29, 2007 3:37:49 PM
how i can check the power supply if its work or not befor i use the device without using digital multimeter???
anonymous
Power Supply
Monday, August 27, 2007 1:30:14 PM
could u do to me a schematic circuit variable output 2-12v 8A ac and dc from 240v. in the circuit will have relay,inductor,transfomer, rotating switch, fius, diod, transistor, LED,capacitor, and BR.plz
obeth
Power Supply
Saturday, August 25, 2007 11:38:41 PM
its nice.. pls help me how to make a power supply
randolph
Power Supply
Saturday, August 25, 2007 9:08:53 PM
hi aaron, can you help me? i need a 44-50 volt 3-5 amp power supply. i perfer 48 volts and 4 amps. i need 14 of these so i have to build them extremely cheap. thanks randolph
Aamer Mehmood
Power Supply
Thursday, August 23, 2007 2:56:25 AM
sir plz help me in designing 220v Ac to 5v dc power supply
SAGAR TILEKAR
Power Supply
Friday, August 17, 2007 8:26:32 AM
hello sir pls help me my in design i.e powersupply using lm317 ic of 0to24v 5amp
contreiras
Power Supply
Thursday, August 16, 2007 5:26:20 AM
hi can you plz help build a ps with following specification: inpout voltage 230v ouput 12v 5A
rickstah
Power Supply
Wednesday, August 15, 2007 10:44:11 PM
i need a regulated power supply shemactic diagram of 12 volts, 6 ampere and its components tnx..
anonymous
Power Supply
Saturday, August 11, 2007 10:38:01 AM
i want to have power supply schematic diagram that has 5vdc regulated output terminals
anonympus
Power Supply
Tuesday, August 07, 2007 9:52:40 PM
sir pls send me in e-mail the important information about 24 volts output power supply,220 v input. thank you.....
tan nguyennonymous
Power Supply
Tuesday, August 07, 2007 6:51:02 PM
hello sir : I bought a power supply,but Ihad the problem with 3.3 v (too much noises). Would you show me how to get the noises off. Thank you sir.
anonymous
Power Supply
Tuesday, August 07, 2007 1:40:31 PM
Using a transformer closer in voltage to your output voltage would help your heat problem with the regulator. 3 to 5 V above the desired output on C1 would be good. i.e. if you want 5VDC then 8 to 10VDC should be supplied by the transformer/bridge/capacitor circuit. You should still use a heatsink but a fan will not be necessary ... Hope this helps!
kaleeswaran
Power Supply
Monday, August 06, 2007 5:52:22 AM
i need 24V O/P single.plz guide me that circuit details..
Potsotso
Power Supply
Monday, August 06, 2007 1:59:07 AM
Hi I would like to know how to built a power supply with a maximum output of 12V then step it down to 9V, then 5V lastly to a minimum of 3V.
meli
Power Supply
Sunday, August 05, 2007 7:58:23 PM
pls provide wat is the meaning of power supply in clear manner
Abhijit
Power Supply
Friday, August 03, 2007 4:20:53 AM
hello sir ,can u plz help me in desigining 0-30v & 0-2A power supply ..thanks
Abhijit
Power Supply
Friday, August 03, 2007 4:17:50 AM
hello sir ,i needed help to design a 0-12V/5amp power supply using programmable regulator..can u plz help.thank you
tolu
Power Supply
Thursday, August 02, 2007 11:51:04 PM
pls i need a power supply with regulated 13volts output and limited current supply not exceeding 2amp.
bhushan patil
variable power supply using regulator ic LM317 forcurrent of 5A
Wednesday, August 01, 2007 12:51:30 PM
iam unable to design this supply plz heip me forthe same
rohit khurange
Power Supply
Wednesday, August 01, 2007 10:17:52 AM
hello sir, i want to make 9v,500mA unregulated power supply so i want know the components value.
dennis ganzan
Power Supply
Tuesday, July 31, 2007 9:13:51 PM
sir.. maam..! i need variable power supply and fullwave power supply brigde type.. thanks sir..maam..!
Deepak goswami
Power Supply
Monday, July 30, 2007 7:56:11 AM
hi guys, plz provide me circuit diagram or idea which convert ac voltage in to variable dc means 5volt to 25 volt..and with constant current.(up to 25 ampere max. current setting)....plz provide this circuie for my career project....
Umesh
Power Supply
Monday, July 30, 2007 7:16:25 AM
Sir I want -12V,2A regulated power suply with external over voltage protection circuit & also over current indicator.
tejas
Power Supply
Saturday, July 28, 2007 4:24:21 AM
power supply of +/- 5V,500mA
Lem
Power Supply (variable output)
Friday, July 27, 2007 8:27:01 AM
Hello sir! I want to make a variable output power supply(AC-DC) with computations or calculations. Please guide me!.....Thanks in advance!
divya
Power Supply
Tuesday, July 24, 2007 11:07:49 PM
hello sir, i need to design power supply having dual output(+/-)on pcb so for that i want complete circuit diagram & its description so pls kindly guide me...
jagdish
Power Supply
Tuesday, July 24, 2007 2:54:21 AM
i want power supply which gives the o/p with variable dc up to 30 volt and constant 29 amp current any one can help me..its very challenging.............so think........
jagdish
i need circuit diagrma which convert ac in to dc variable with 29 amp current
Monday, July 23, 2007 2:10:40 PM
hi guys, plz provide me circuit diagram or idea which convert ac voltage in to variable dc means 5 to up to 25 volt..and with constant 29 ampere current....plz this for my career project....
La
Variable Power Supply
Sunday, July 22, 2007 8:37:32 AM
I Need a variable dc power supply layout ranging from 9-15 volts dc. Please..thanks
kelvin
Power Supply
Wednesday, July 18, 2007 12:07:49 PM
i have some batteries and want ac power, does anyone knows how do i know how much ac power i can get out of the batteries. the batteries can give me 12 v.dc 600 watts how much watts can i get in ac,
Richard
Power Supply
Monday, July 16, 2007 6:11:53 AM
please sent me a power supply schematic diagram of 3 multiple outputs of about 30v fully stabilized
KAYLA
Power Supply
Monday, July 16, 2007 12:42:54 AM
i need help finding a power supply i need a good +11 and -11 volt
pratish
Power Supply
Saturday, July 14, 2007 11:16:13 AM
hello sir i needed help to design a 0-12V/5amp power supply using programmable regulator..can u plz help.thank you
edward mendoza
Please help me!
Friday, July 13, 2007 8:09:00 PM
I WANT TO CONSTRUCT A DC VARIABLE POWER SUPPLY FROM 0 - 15 VOLTS. PLEASE HELP ME FIND THE SCHEMATIC DIAGRAM FOR THAT! THANKS!!!
rey
Transistorize 15 volts variable with current limiting Power Supply
Friday, July 13, 2007 2:58:40 AM
Hello, Sir i want a Transistorize 15 volts variable with current limiting Power Supply can you please help me? I want to get a schematic diagram of that, thanks
lan'Z
Power Supply
Wednesday, July 11, 2007 9:56:27 AM
need circuit diagram for 5v and 10v power supply....
anonymous
Power Supply
Thursday, July 05, 2007 4:29:37 PM
I have a power supply and I need to be able to reproduce it, the only problem I have is I don't know what type of transformer it is, I'm thinking it's a rectifier transformer. The power supply has the following; 1 transformer (unknown, has 2 lugs for primary input 120v, w/ a resistor across the lugs, has 3 lugs secondary output) 2 capacitors 5000 mfd 50 vdc 2 fuse holders w/ 4amp fuses 1 bridge recitfier gbpc2504 this power supply produces 32v + and 32v - and a common for both of these voltage outputs.
anonymous gedam kenneth
Power Supply 50volt d.c stabilized power supply
Wednesday, July 04, 2007 9:12:23 AM
i need an introduction to details about power supply and also a circuit diagram/ schematic diagram of a 50volt d.c stabilized power supply.
bhonz
Power Supply
Friday, June 29, 2007 7:07:54 AM
hi! i need to construct a 6 ampere, 200 watts output, split-type power supply for my project. pls help my.i need a schematic diagram for that!thanx!Gob bless!!!
ryan
Power Supply
Friday, June 29, 2007 5:24:10 AM
in this case please help me to make fixed 12 V out-put without using voult meter,,thnks
Marck Gerardus
Seems to me that yo have the same Idea that I have But whitout the Microcontroller!
Thursday, June 28, 2007 4:32:45 PM
Will you be willing to Give me an simple explanation, of how your system generate the pulce to keep resirculating the power Trhought ?? for yor time and your help Thank you very much !! Marck
ETCM ERIC
Power Supply
Wednesday, June 27, 2007 9:47:34 AM
I need help in constructing A DUAL OUTPUT 15 VOLTS DC POWER SUPPLY,KINDLY RECOMMEND A SIMPLE CIRCUIT DIAGRAM AND GIVE ME SUITABLE COMPONENTS AND REPORTS. THANKS.
anonymous
Power Supply
Wednesday, June 27, 2007 12:30:39 AM
I have a problm with above circuit.It gives only 9V to 13V only. pls reply me. urgent
vishaka tyagi
DUAL POWER SUPPLY
Monday, June 25, 2007 2:18:31 PM
i need the supply for +12 and -12 volt in a single circuit. plz give me the info.
sheckinah
Power Supply
Friday, June 22, 2007 8:31:39 AM
this is good,but i can't find the function of power supply...and it's annoting me so much because i'm in a hurry and i need to find it asap..
sheckinah
Power Supply
Friday, June 22, 2007 8:29:19 AM
this power supply is very useful but i can't understand it?
asdfgus
Power Supply
Thursday, June 21, 2007 5:39:55 AM
PLEASE I WANT TO CONSTRUCT A DUAL OUTPUT 15 VOLTS DC POWER SUPPLY,KINDLY RECOMMEND A SIMPLE CIRCUIT DIAGRAM AND GIVE ME SUITABLE COMPONENTS AND REPORTS. THANKS.
nital
Power Supply
Thursday, June 21, 2007 2:31:07 AM
I would like to design a 110VDC/12VDC Power supply. Please can you help me?
anonymous
Power Supply
Wednesday, June 20, 2007 10:18:57 PM
i need a true diagram of a power supply.
martin ogu
Power Supply
Saturday, June 16, 2007 3:28:23 AM
place sir, i will be greatful if you can assist me with the schematic diagrams of the power supply unit of a desktop computer and laptop with input of 220v. thanks
jaimin shah
Power Supply
Thursday, June 14, 2007 5:52:51 AM
sir i need a power supply for voltage varrying between 0 to 0.3 v, so please give me a circuit or some idea for that thank you
sham
Power Supply
Thursday, June 14, 2007 12:05:27 AM
PLEASE I WANT TO CONSTRUCT A DUAL OUTPUT 15 VOLTS DC POWER SUPPLY,KINDLY RECOMMEND A SIMPLE CIRCUIT DIAGRAM AND GIVE ME SUITABLE COMPONENTS AND REPORTS. THANKS.
teung
Power Supply
Tuesday, June 12, 2007 12:08:35 AM
hi I have been searching for online help and got directed to ur site. i wanted to construct a 0/+24V and constant 5V with 1A current. Can you please help me build this. Its for my analog electronic course. Help from you will be greatly appreciated.
Andrew Cousley
Power Supply
Monday, June 11, 2007 9:49:16 AM
My name is andrew cousley and i will like to know more stuff about power supply
nnenna
Power Supply
Monday, June 11, 2007 9:01:29 AM
design and implementation of power supply
NASR SHAHZAD
circuit designing
Tuesday, June 05, 2007 3:58:52 PM
i am new in this field please give me basic and advanced critarias of cct designing
sammy
Power Supply
Tuesday, June 05, 2007 8:17:32 AM
PLEASE I WANT TO CONSTRUCT A 15 VOLTS POWER SUPPLY,KINDLY RECOMMEND A CIRCUIT DIAGRAM AND GIVE ME SUITABLE COMPONENTS. THANKS.
Aqeel
Thanks
Tuesday, June 05, 2007 2:59:53 AM
Sir Im very thankful u that u give so easy circuit
dharmesh
Power Supply
Monday, June 04, 2007 9:45:34 AM
i need power supply
Isaac
Regulated Power Supply
Sunday, June 03, 2007 7:40:02 PM
Hello! i need built a power supply: -12 0 +12 Volts. Really is a dual power supply. How can I doit?
anonymous rohitt_raaj@yahoo.co.in
Power Supply
Saturday, June 02, 2007 5:44:38 AM
how to design 12volt and 5 ampere regulated power supply
Buali
Power Supply
Saturday, June 02, 2007 1:16:51 AM
I'd like you to send me the report please so that I may get a better understanding of this power supply.
Snip
Power Supply
Thursday, May 31, 2007 11:05:03 AM
Can you tell me what gonna happens if i make it with a 24V / 1,8 A Tramsformer? (Becouse i have one at home, and if it will be not a big problem i dont buy another one) Thx
Austin
Power Supply
Tuesday, May 29, 2007 11:32:11 PM
hi I have been searching for online help and got directed to ur site. i wanted to construct a +/-30V and constant 5V with 1A current. Can you please help me build this. Its for my analog electronic course. Help from you will be greatly appreciated.
bilal
12 to 120 volt inverter
Saturday, May 26, 2007 5:25:03 AM
i have tried your many circuit diagrams.but no one works.you are hiding many things in that
Ray
6v DC to Power a 12v Fan
Wednesday, May 23, 2007 4:03:31 AM
Can someone help me on this, I'm not good with electronics and I was just trying to build a cooler for my game system, and I used a 6v power supply to power a 12v Fan.....it worked for about 15min. and then died, I found out it was the power supply that died and it was pretty hot but the fan was ok, did this happen because I used the wrong power source or it is somthing else? any answer would be appreciated thanks!!

(Editor's notes: Use a 6V fan.)

FARHANA TAJAMMUL
DC Power Supply OF +5V
Wednesday, May 23, 2007 12:28:54 AM
PLEASE SEND ME A COMPLETE REPORT ON DC POWER SUPPLY OF +5V PLZ SIR DO THIS FAVOUR REGARDS FARHANA
anonymous
Power Supply
Sunday, May 20, 2007 2:13:56 AM
good
shriya
Power Supply
Sunday, May 20, 2007 12:20:27 AM
thank you very much sir,for the circuit.I am very happy to say that we worked on it and got the output succesfully
anonymous
Power Supply
Tuesday, May 15, 2007 11:53:53 AM
from 1.2 to 25 volt
manoj kumar meena
regulated power supply
Tuesday, May 15, 2007 11:07:33 AM
please send me a circuit of regulated power supply. oslo i want report on this topic actualy it is my minor project.i wish you can send me a report on this topic.
hay_ott
Power Supply
Sunday, May 13, 2007 4:46:17 AM
hi...i would like to ask you the meaning of power supply

(Editor's notes: Google "define:power supply": A separate unit or part of a circuit that supplies power to the rest of the circuit or to a system. www.flw.com/define_p.htm)

anonymous
Power Supply
Saturday, May 12, 2007 3:16:50 PM
Hi i got a question for you. Ok first I'm a Tattoo Artist And all my Tattoo Machines Can run up to 12 Volt. I got a 12 volt 500 M/A Power supply. My problem is I want a varable to change the output Voltage To beable to decrease the voltage for different speeds Some where from 6 Volts Up to the normal output 12 volts 500 M/A. Iv tryed running a 500 ohm pot between the two positives but it burns the pot up, I also try a few other different wiring with the pot it burn up every time. If you could give some addvice it would be greatly appreciated!

(Editor's notes: Look up PWM motor controllers.)

Dipon Sarkar
Power Supply
Saturday, May 12, 2007 3:52:53 AM
hi sir , i want a power supply ckt. for leds (100 watt)
NISHANT
Power Supply
Saturday, May 12, 2007 2:02:07 AM
PLZ. SEND ME CIRCUIT DIGRAM OF DC REGULATED POWER SUPPLY. 0 TO 18 VOLT SEND PROCESS HOW CAN WE MAKE IT.
rray salas
power supply
Tuesday, May 08, 2007 6:56:06 AM
hi sir...can i ask you a favor to teach me how to make a power supply in a simple way...may i ask also a design from you?...im very much thankful if you grant my request...thanks!!!
darkside
0 to 15 volts Variable Power Supply ( 3 ampere )
Monday, May 07, 2007 3:19:08 AM
good day sir, i need 0 to 15 volts variable power supply..and i want to know the compuation on it..for example the capacitors..etc..i hope you submit it as soon as a possible..thank you..my email address ...deadline of our submission is may 14, and 15, 2007
achal
Power Supply
Sunday, May 06, 2007 8:31:40 AM
i need the supply for +12 and -12 volt in a single circuit. plz give me the info.
aungkhine
Power Supply
Sunday, May 06, 2007 5:31:40 AM
sir, I need (5V) to (12V) power supply For flashing LED circuit.
Manish Khurana
24 V DC Power Supply
Saturday, May 05, 2007 2:56:12 AM
Please provide Ckt. diagram for 24 V DC, 500 mA regulated power supply. Want to drive 2 SPDT relay of 24 V DC, 10 A, & 6 LED's.
MAJU V THOMAS
Power Supply
Friday, May 04, 2007 1:20:47 PM
My search light needed input of 12 volt dc, 15 amp.supply. as i had got a eliminator whic is 0 - 15 V dc regulated supply, and max amp of 25 amps. when I connect the light to it, only filament burning light output is there and output voltage showing as 5volt , 2 amp. wat to do.
Samiullah
Power Supply
Thursday, May 03, 2007 4:32:56 AM
I need a power supply with following Output requirements 8 Amperes, 20 Volts, 100 Watt power which i want to use for Diamond Anvil Cell Heating system.
Adnan Mahboob
Power Supply
Thursday, May 03, 2007 1:10:02 AM
Plz it is our final term Assignment help me "construct a power supply who's output is 12vD.C and having minimum ripple effect"
anne
30 volts + 3 amperes regulated power supply with transistorized current limiter
Wednesday, May 02, 2007 1:22:44 AM
good p.m. here in phil.i have this problem of making a 30 volts + 3 amperes variable power supply with transistorized current limiter that will last at least a minimum of 3 minutes.pls.,do help me.i really need the schematic diagram of it if you have.A million thanks to you.i'm waiting for your reply.
anonymous Gary
Power Supply 24 Volts
Monday, April 30, 2007 9:10:15 PM
Sir, I need a 24 volt DC power supply to feed my 24 volt PWM DC motor speed control which is rated for 15 amps, but I only need the power supply to supply a regulated 24 volts at 5 amps. The LM338K would do fine. I will be building a total of 15 of them to control my 15 G scale trains. I have a Buck Boost 12/24 volt transformer rated for 62.3 amps at 24 volts AC which is more than I will need and each train will pull a maximum of 1 to 3 amps. In your schematic you show very large input capacitors and I would think that a single 10mf to 100mf for the input and a single output capacitor would be sufficient for my application being small DC motors. What are your thoughts? If you could email me a schematic with components and values I would appreciate it. Thank you Gary
mars
Power Supply
Sunday, April 29, 2007 11:11:24 PM
pls. tel me hw 2 construct pwr supply w/ d output of 12 volts
mashudu
regulated and unregulated Power Supply
Sunday, April 29, 2007 4:28:20 AM
Hi sir my name is mashudu, can you please send me the difference between regulated and unregulated power supply
jack
Power Supply
Saturday, April 28, 2007 10:24:25 AM
im trying to put a 1100watt subwoofer,amplifier,radio and tweeters in my room and i don't know what kind of power supply to use
Julian
Power Supply
Thursday, April 26, 2007 1:29:22 PM
Can you tell me how to built output +12V, 0V, and -12V? Will it be use 1 or 2 trabsformer?
Buali
Power Supply
Monday, April 23, 2007 6:54:32 AM
It seems to be very easy to do such a power supply just like that. I'd really like to try one but I'm not familure with the components which have been used. However, most of the components (trade number/technical number or name) were not clearly shown. That makes it more dificult to me to find out how to use it searching for the data sheet. For example, "LM338K" can be found easily, but the rest of the components were not. I'd like to ask you please help me due to this issue. Can you please send me the data sheet for each component?
JOn@s
Power Supply
Saturday, April 21, 2007 4:55:20 PM
Just great, i build it and it works great. Thanks for the circuit.
Asra Shoaib
Power Supply
Friday, April 20, 2007 5:34:10 AM
plz,kindly can u send me simple 5 volts power supply circuit ,i have got task,kindly help me urgent
ibrar anwar
Power Supply
Friday, April 20, 2007 2:18:47 AM
Sir kindly send me the circuit of power supply,which has output of 12v,and has maximum ripple effect.
Ashraf
Power Supply
Tuesday, April 17, 2007 2:57:05 AM
Sir please provide me circuit diagram of power supply whos output should be 31volts and 14.5volts for running my PSC
sardar kashif
Power Supply
Monday, April 16, 2007 3:10:57 AM
i have a project to construct a variable power supply upto -+20 volts output plz send me circuit for it
ankit sharma
Power Supply
Sunday, April 15, 2007 2:46:27 PM
sir kindly provide me power supply of 5V from 220v A.C using 220-6v transformer
Xitemaster
Sending Me Advice For Amperes Regulator.
Sunday, April 15, 2007 2:33:55 PM
Please send me the schematic diagram of 12volt 35milliamperes power supply and please tell me how I can convert 12volts 8amperes power supply into 12volts 35milliamperes & also give me information on ampere regulation. Please response me on my email as soon as possible.
Azeem
Power Supply
Sunday, April 15, 2007 3:57:31 AM
Hi Sir Kindly sir send me circuit of power supply which contain zenor diode and BJT
Arjun
Power Supply
Thursday, April 12, 2007 2:04:05 PM
Hello sir, i want to do a mini project .Can u provide me circuit for versatile power supply. It is urgent so please forward it to my email id.
ANAND KUMAR
Power Supply
Wednesday, April 11, 2007 2:05:54 PM
i wud like to have 12-0-12 power supply internal ckt diagram xplanation as quick as possible
oyebade bimbo
Power Supply
Saturday, April 07, 2007 8:57:08 AM
It's good to discover new invention
joey
Power Supply
Monday, April 02, 2007 10:43:24 PM
Hello sir...I want to know about the function of power supply.
joey
Power Supply
Monday, April 02, 2007 10:38:44 PM
Hi sir, good morning..........i need a power supply models.i want to know how about the function of power supply.
Jim Griffin
Power Supply
Sunday, April 01, 2007 4:25:50 AM
Thanks. Very useful site.
sarah
Power Supply
Wednesday, March 28, 2007 7:15:09 AM
i need a circuit design for power supply + regulator + 5V + 1A and it explanation..please..as soon as posibble
anonymouslavanya
Power Supply
Wednesday, March 28, 2007 7:14:14 AM
plz send the circuit for + -12v&5v in a single circuit.
Abdul majee Awan
Power Supply
Monday, March 26, 2007 11:47:22 PM
need detaled circuit diagram for unduction heater 2500watts
anonymous
Power Supply
Monday, March 26, 2007 7:22:00 PM
i need to build a -/+ 5 V .5A power supply with no voltage regulator, anyone can help me please,
dymas
Power Supply
Saturday, March 24, 2007 12:07:15 PM
SO SIMPLE ..... GIFT ME HARD.....
anonymous
Power Supply
Friday, March 23, 2007 1:14:15 PM
I need the 5amp with 5V regulated circuiti need the 5v for my assignment... if any body have plzz send me humanlover74@hotmail.com
roeyant
Power Supply
Thursday, March 22, 2007 10:34:11 PM
i want the output of the circuit max 15 V DC
anonymous
Power Supply
Tuesday, March 20, 2007 3:25:22 PM
cool
subhas chatterjeenymous
Power Supply
Tuesday, March 20, 2007 7:16:23 AM
Please give me some Configuration and Architecture related documents in the email
sandeep av
Power Supply
Saturday, March 17, 2007 2:14:46 AM
Sir/Madam, I am sandeep, design engineer, BPL Telecom, Palakkad. We are in need of a power supply with the following specifications. Input Voltage +48v,-48v Output Voltage +-50v Output current 5A Can anyone help me to send the circuit diagram of the above specified product. Thank you, Regards, Sandeep
anonymous
Power Supply
Thursday, March 15, 2007 3:40:30 AM
does this project works on 220VAC

(Editor's notes: Yes. Just use a 200V transformer.)

anonymous
Power Supply
Wednesday, March 14, 2007 10:18:42 PM
can you please present the wiring diagram
anonymous
Power Supply
Tuesday, March 13, 2007 12:55:25 PM
i need the 5v 1A power supply regulator circuit for my assignment...anyone can help me?alcatraz0515@yahoo.co.uk
shebanz
Power Supply
Sunday, March 11, 2007 8:55:53 AM
i definitely enjoy reading your site... thank you.
MINA
Power Supply
Saturday, March 10, 2007 12:51:28 PM
i want the output of the circuit 5 & -5 & 12 & -12 & 15 &-15
palitha wiratunga
Power Supply
Friday, March 09, 2007 1:23:31 AM
this circuit is very good .but i needs 12. to 38 volt veriable power supply circuit diagram i you or your freind having such circuir kindly send me by e-mail thanks palitha wiratunga palitha51@post.com
david Ngaruiya
Power Supply
Wednesday, March 07, 2007 6:00:27 AM
nice circuit. I tried it.
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