50 Watt Amplifier


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This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it makes a great amp for a small subwoofer.

Schematic

This is the schematic of the 50 Watt Amp

Parts

Part
Total Qty.
Description
Substitutions
R11200 Ohm 1/4 W Resistor
R21200K 1/4 W Resistor
R3130K 1/4 W Resistor
R511K 1/4 W Resistor
R615K 1/4 W Resistor
R7,R1021 Meg (5%) 1/2 W Resistor
R8,R920.4 Ohm 5 W Resistor
R11110K Pot
R12,R13251K 1/4 W Resistor
R14147K 1/4 W Resistor
C11100uF 35V Electrolytic Capacitor
C210.011uF Capacitor
C313750pF Capacitor
C4,C621000pF Capacitor
C5,C7,C830.001uF Capacitor
C9150pF Capacitor
C1010.3uF Capacitor
C11,C12210,000uF 50V Electrolytic Capacitor
U1,U22741 Op Amp
U31ICL8063 Audio Amp Transister Driver thingy
Q112N3055 NPN Power Transistor
Q212N3791 PNP Power Transistor
BR11250 V 6 Amp Bridge Rectifier
T1150V Center Tapped 5 Amp Transformer
S11SPST 3 Amp Switch
S21DPDT Switch
F112 Amp Fuse
SPKR118 Ohm 50W Speaker
MISC1Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2

Notes

  1. I know I skipped R4. That is not a problem :-)
  2. Distortion is less than 0.1% up to 100HZ and increases to about 1% at 20kHz.
  3. I haven't been able to find anyone who sells a suitable T1. You can always use two 24V 5A units in series. If you are building two amps (for stereo), then I would suggest using an old microwave transformer and rewinding it. Follow the instructions in the 12V To 120V Inverter, execpt wind 26 turns, twist a loop (center tap) and wind 26 more turns. That should work out to around 50 volts. You may need to add or remove turns depending on your transformer.
  4. Q1 and Q2 will require heatsinks.
  5. You may have trouble finding U3 because it is discontinued. Please don't email me about sources...I can't find it either. See if any of the sources in Where To Get Parts has it. A possible source was sent in by JBWilliams:
    Zigma Electronics
    8803 Shirless Ave.
    Northbridge, CA 91324
    United States
    Phone: 818-772-7590
    

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Comments

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rihards
50 Watt Amplifier
Wednesday, May 27, 2015 6:34:37 AM
cant you show the picture how its looks in life ?
Kris
50 Watt Amplifier
Sunday, April 15, 2012 11:30:27 PM
Can someone please tell me where to connect all the earth GNDs...
EKOH PHOENIX
50 Watt Amplifier
Tuesday, March 02, 2010 7:48:48 AM
ICL8063(U3),which other IC can I use to replace it for better result.Kindly reply through my e-mail.Thanks.from Nigeria
nightwing
50 Watt Amplifier
Tuesday, December 22, 2009 9:31:07 PM
what value low pass filter do you recommend for use as with a bass guiter? Should I build it separate, or utilize a second input with the filter? That way I can use the amp for other things if needed.
Paul
50 Watt Amplifier
Monday, October 26, 2009 3:30:56 AM
I'd use replacements where the 741 opamps are. They have crappy frequency response, crappy noise ratings, and crappy slew rate.
Paul
50 Watt Amplifier
Monday, October 26, 2009 3:27:57 AM
p=v^2/r p power in watts v rms voltage, volts r load resistance
Tom
50 Watt Amplifier
Sunday, June 21, 2009 10:10:59 AM
U3 also known as ECG8063
jake
computations of output power of an amplifier
Monday, January 26, 2009 2:55:41 AM
does anybody can tell me about the computations of output power of an amplifier?just reply on my e-mail.
george
50 Watt Amplifier
Tuesday, December 02, 2008 9:58:57 AM
where ic can i use for U3
joevilou mallen
50 Watt Amplifier
Tuesday, November 25, 2008 3:18:28 AM
i have 8 ohms speaker,,, could you send me a diagram that fit on it???? what is the wattage of th amplifier???? hope any body can send ma a diagram on it. thank you guys and good luck!!
anonymous
50 Watt Amplifier
Tuesday, August 05, 2008 3:38:45 AM
how about posting pcb layout for ease..

(Editor's notes: Make one, send it to me, and I'll post it.)

manjula
50 Watt Amplifier
Friday, June 27, 2008 4:45:33 AM
i could not buy ICL8063 Audio Amp Transister Driver thingy
TOLUWASE
50 Watt Amplifier
Monday, February 18, 2008 1:02:40 PM
Thanks to you my Brothers in this great field (electronics), the AF circuit I downloaded from this (your) site really worked for the project I proposed (higher wattage), only a little components was added. Thanks, Toluwase 4m Nigeria
aneesh
50 Watt Amplifier
Monday, January 28, 2008 5:01:09 AM
Very good but quite expensive
rononymous
50 Watt Amplifier
Saturday, January 26, 2008 4:51:02 AM
not as good as bipolar amplifier.difficult circuit to build
jhun
50 Watt Amplifier
Saturday, January 12, 2008 2:07:43 AM
sir can you give me a circuit diagram of 50 watts and 8 ohms output?
anonymous
50 Watt Amplifier
Wednesday, January 09, 2008 11:01:53 PM
can u forward me a low cost 100 watt guitar amp. in my email plzzzzzz????where its circuit is simple???
gono
50 Watt Amplifier
Wednesday, December 05, 2007 3:56:23 AM
can i know what is specially and baddest use this amplifier?please give your answer on my e-mail!!! i am from indonesia
Unknown 13
50 Watt Amplifier
Friday, November 23, 2007 9:23:34 PM
I could'nt find an exact .40 ohm resistor. could i use a .30 and a .10 one after another?
Unknown 13
50 Watt Amplifier
Friday, November 23, 2007 9:01:32 PM
Is the potentiometer for the volume? Can i subsitute that with your digital volume control
anonymous
50 Watt Amplifier
Thursday, November 22, 2007 9:49:30 AM
http://www.mouser.com/search/ProductDetail.aspx?R=UA741CPvirtualkey59500000virtualkey595-UA741CP Would this work for the op amp? if not, could you supply me with a link for one?
neill
50 Watt Amplifier : ICL8063
Tuesday, November 13, 2007 6:42:24 PM
require source of supply for ICL8063 IC ????
ayinde
50 Watt and above amplifier
Friday, November 09, 2007 5:21:07 AM
Sir, please I need an amplifier that can amplify a 6V, 0.12mA oscillator to about 6V, 5A for my personal project. The project is a pure sinosoidal inverter system. I will be very glad if you can help me out sir. Thanks and God bless.
warwin
50 Watt Amplifier
Thursday, September 27, 2007 2:42:27 AM
please send the pcb foil pattern for this amplifier.....thanks a lot.....
EP
50 Watt Amplifier
Sunday, September 23, 2007 10:15:53 AM
Sir , I am trying to understand the space for Aluminum electrolytic capacitorswit organic electrolyte in Audio amplifiers and power supplies. This caps have Very low ESR like SANYO OSCON Fujitsi FPCAP etc. IF i am correct one could use smaller capacitors. with even better performance Am I right >?
miro
50 Watt Amplifier
Tuesday, September 18, 2007 2:47:42 AM
what is the total price of all the materials and parts?
oliver ian moron
50 Watt Amplifier
Saturday, September 15, 2007 2:47:50 PM
SIR, i would like to ask you if you have the whole detail about how to construct this 50W amplifier, and also the PCB layout if possible. thank you very much!
ayodeji
50 Watt Amplifier
Tuesday, September 11, 2007 6:29:25 AM
pls,i need pcb layout of this amplifier and brief me on how to design and build this 50watt amplifier.Thanks
evaline
100 watts transistorised amplifer
Monday, September 10, 2007 12:38:25 AM
i need to have a 100 watts transistorized amplifier design and its PCB layout... please help!!!!!!
edgardo
50 Watt Amplifier
Sunday, September 02, 2007 11:11:37 PM
sir, i could ask for ur help regarding my project in school...i could ask u a diagram of 100 watts amplifier that for my project...hope u send it soon sir... thanks a lot...GOD BLESS U.......
jon
50 Watt Amplifier
Sunday, September 02, 2007 5:22:52 AM
please send me pcb lay-out.just send me the layout at my email...please....i really need that..

(Editor's notes: There is no PCB lay out. Period.)

Tehseen Ashraf
50 Watt Amplifier
Friday, August 31, 2007 5:46:41 AM
Its a great circuit with great frequency response.. any have some more Transistorised audio amp circuits please send me..
Mashound
100Watt Amplifier
Monday, August 27, 2007 2:36:40 PM
please i would need a briefing on how to design the power amplifier mentioned above
enjel bernaldo
50 Watt Amplifier
Saturday, August 18, 2007 2:11:38 AM
i like ur amplifier it is so nice..thank
anonymous
50 Watt Amplifier
Thursday, August 16, 2007 7:13:00 AM
please send me pcb lay-out for this design. tnk u very much. mmmuuuaaah
hermie
50 Watt Amplifier
Monday, August 13, 2007 1:04:09 AM
is it possible to use a power supply rating of 24v rms? a 50 volts supply is very to look here in our country. and if ever there is, it cost a lot.. and id like to have the pcb layout...... tnx......
emadedwardz
2way x 100 Watt Amplifier
Saturday, August 11, 2007 8:31:45 AM
i need a circuit diagram design for 2 way x 100 watts audio amplifier
tony
50 Watt Amplifier
Thursday, August 09, 2007 3:44:12 PM
i like the diagram.
Waheed
50 Watt Amplifier
Tuesday, July 17, 2007 4:39:11 PM
1/ Can I bridge 2 of these amplifiers to have a 200W BTL amplifier, and if there are any restrictions ( speaker resistance, etc...) 2/ Is there a PCB for this circuit. Thank you. Waheed
KITUU
50 Watt Amplifier
Tuesday, July 17, 2007 8:22:23 AM
Thanks sir for the 50watts,i have a 16 ohms subhoofer speaker please send me a cicuit design that fits this speaker
anonymous
50 Watt Amplifier
Wednesday, July 11, 2007 8:05:29 AM
pls send me a pcb lay-out sir.. ty..

(Editor's notes: There isn't one. Further questions of this nature will not be approved.)

archer
50 Watt Amplifier
Monday, July 09, 2007 9:04:22 AM
thanks for your design sir.but I have a 100watts speaker can you send me design for that.thanks...
jboy
50 Watt Amplifier
Saturday, July 07, 2007 1:29:13 PM
could i ask for the Low Pass Filter and the pcb layout and mounting? i would be glad to recieve it from you..Godspeed!!
jong
50 Watt Amplifier
Wednesday, July 04, 2007 12:53:09 AM
pcb layout plz...tnx so much!!!!
mark
50 Watt Amplifier
Thursday, June 28, 2007 3:52:36 AM
pls send me a pcb layout.also send me the circuit of Low Pass Filter at the input so that the amplifier can be used as a Sub woofer amp.
Brent
50 Watt Amplifier
Saturday, June 23, 2007 3:33:23 PM
This circuite is almost perfect. I have 2 50 watt 8 ohm speakers and I want to use them for my computer but they arnt amplified i was planning to make the circuite in a 5.25 bay drive but your circuite seems to be mono not stero. What would I have to do to make it stero but still use only one volume control?
Anutosh
50 Watt Amplifier
Monday, June 18, 2007 8:04:11 AM
Please send me the Low Pass Filter at the input so that the amplifier can be used as a Sub woofer amplifier.
RAMZ
50 Watt Amplifier
Sunday, June 17, 2007 9:39:04 PM
pls send me a pcb layout.....ty
Kenneth Ian Sarte
50 Watt Amplifier
Wednesday, June 13, 2007 5:43:39 AM
Please can you send me a PCB printed circuit board lay-out of this circuit? thanks for your favor! am electronic addict!
paulanopaunymous
50 Watt Amplifier
Sunday, June 10, 2007 11:14:16 PM
please send me a pcb layout sir..thanks
koledowo tajudeen
50 Watt Amplifier
Tuesday, May 22, 2007 12:01:10 PM
iwish tomade an fm radio formy project pls send it to me
i wish to made a small fm radiofor my project can u please send it to me
50 Watt Amplifier
Tuesday, May 22, 2007 11:57:57 AM
thankfor providing this
filipe
50 Watt Amplifier
Tuesday, May 22, 2007 4:25:29 AM
tje icl8063 not exist that component I can for in the place of this
mike rikwava
50 Watt Amplifier
Friday, May 11, 2007 7:20:39 AM
i am prepared to build the amp for my project
chheta
50 Watt Amplifier
Thursday, May 10, 2007 9:56:58 AM
i want to copy this circuit. can you send to me?
knowledge
50 Watt Amplifier
Wednesday, May 02, 2007 10:16:38 AM
the amp is just fantastic
shaleshale
50 Watt Amplifier
Wednesday, April 25, 2007 5:38:07 AM
sir,please send me the pcb lay out of this circuit bcos i intrested to do this project for my domestic radio reciever
Alex
50 Watt Amplifier
Monday, April 23, 2007 3:35:53 AM
Hi,this circuit fantastic and has got the power.
render go
50 Watt Amplifier
Monday, April 23, 2007 2:16:39 AM
hi sir pls send me the pcb lay out of this project becaus im going build this tnx!
bokbok
50 Watt Amplifier
Monday, April 23, 2007 12:15:14 AM
please send me the printed circuit in pcb
kashif khan
50 Watt Amplifier
Saturday, April 21, 2007 5:28:51 AM
its really very interesting and good but do it again 4 2 spkrs i am student of electronic engg
anonymous
50 Watt Amplifier
Tuesday, April 10, 2007 8:38:59 AM
Since the transformer is rated for 50 v secondary, the capacitors C11 and C12 must be rated for more than 50 v. ie, for about 100V. Otherwise it will get leaked.
tkflux
50 Watt Amplifier
Tuesday, April 10, 2007 3:48:20 AM
i want to have a copy of this as a project
Homer Simpson....Doh!
50 Watt Amplifier
Wednesday, April 04, 2007 8:16:09 PM
hi, i like this idea
sandeep sharma
50 Watt Amplifier
Friday, March 30, 2007 5:40:37 AM
what will be the total cost of this amplifier
Joseph Balo
50 Watt Amplifier
Wednesday, March 28, 2007 4:12:01 AM
Please send me the complete diagram of this amplifier design. i find this much better than my previously assembled audio amp.
anoop
50 Watt Amplifier
Thursday, March 22, 2007 8:46:02 AM
pls sent theb complete circuit of 50w amp to my email adress.
evanas
50 Watt Amplifier
Monday, March 19, 2007 2:23:46 AM
i would like to have the diagram and also another where i can have an auto temp controlled fan in the system . please i would deeply appreactite it
wissam toameh
50 Watt Amplifier
Friday, March 16, 2007 7:48:27 PM
hi sir, i will graduate this semester in electronic engineering with a BS degree and i will made the 50 watt amplifier so please i will be very thank if u answer me this questions: 1-the input voltage of the circuit 2-a full detail of the project 3-the input voltage and current of the circuit after passing T1 and BR1. 4-can i add the project mono to sterio at the out put to have 2 out puts. 5-can i add to this project the digital volume control , if i can put it where should i put it,before the mono to sterio or after
nigam
50 Watt Amplifier
Friday, March 16, 2007 10:18:30 AM
please send me a complete circuitor diagram of a 50 W power amplifier in my email address,it will be a big help for me to make my project working.. thanks
roylopez
50 Watt Amplifier
Thursday, March 15, 2007 2:55:35 AM
please send me a complete circuitor diagram of a 50 W power amplifier in my email address,it will be a big help for me to make my project working.. thanks..
TIMOTHY KOOME
simple amplifier circuit
Wednesday, March 07, 2007 8:11:49 AM
i hereby what to request you to send me a circuit diagram of a sound amplifier on my email for me to perfectly do my final year practical i have used some of your diagrams for my practise and they have been a sucess.Thanks alot.
aghete akpofure
50 Watt Amplifier
Tuesday, March 06, 2007 10:39:25 PM
please sir, i need full information of 50 watt amplifier. if u can send it to me, l will be very greatful. thanks
noel ocenar
50 Watt Amplifier
Monday, March 05, 2007 5:32:43 AM
1st of all that one is our project so can u tell me how it workszz . . . if u dont mind 2 help me plszzzzz... ASAP
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