8 Watt Audio Amp

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Here is the schematic for an 8 watt audio amp. This amp can be used as a simple booster, the heart of a more complicated amplifier or used as a guitar amp.

Schematic

LM383 Pinout

Parts

Part	Total Qty.	Description	Substitutions
C1	1	10uf Electrolytic Capacitor
C2	1	470uf Electrolytic Capacitor
C3	1	0.1uF Disc Capacitor
C4	1	2000uf Electrolytic Capacitor	2200uF
R1	1	2.2 Ohm Resistor	Anything Within 10%
R2	1	220 Ohm Resistor	Anything Within 10%
IC1	1	LM383 8 Watt Amp IC	ECG1232, TDA2002

Notes

IC1 MUST be installed on a heat sink.

C3 is for filtering and to prevent oscillation and should not be omitted.

The circuit can be built on a perf board, universal solder board or PC board, the PC board is preferred. I built the circuit on a perf board and had to add a low value inductor at the input to prevent oscillation.

The circuit draws about 880 ma at 12 V.

By swapping the values of R1 and R3, you can turn this amplifier into a guitar amp with no preamp required.

If you can't find 2000uF, then replace C4 with a 2200uF unit.

If you add a 0.2uF capaciitor in series with a 1 ohm resistor to the output you can prevent oscillation of the circuit under certain conditions.

Thanks to James Maloway for redrawing the schematic. The mew image is much easier to read then the old one.

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Comments

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anonymous 8 Watt Audio Amp Wednesday, September 02, 2015 1:32:57 AM

The above circuit will NOT work as is, due to several reasons: 1.) Biasing resistors missing (Add a 20K ohm from +12V to pin 3, and another one from pin 3 to ground - value NOT super critical. 2.) C2 should really be connected in series with R1 (rather than as shown). 3.) Will NOT get 8 watts out of this design. Even if the signal swings rail-to-rail, the most you can get is 2.25 watts (calculations based on a sine-wave audio signal).

anonymous 8 Watt Audio Amp Wednesday, October 29, 2014 7:41:30 AM

I dont have the IC LM383 instead I've LM386 will it work?

jayson baluyot 8 Watt Audio Amp Monday, September 01, 2014 10:15:00 PM

Hi, i'm a new student i'd really like to try this circuit ,but is this circuit really work?

anonymous 8 Watt Audio Amp Wednesday, June 11, 2014 9:26:47 AM

how does it work? I mean its function...

mark 8 Watt Audio Amp Wednesday, February 06, 2013 9:27:21 PM

i am only a high school student.. but i really like electronics. that's why i wnt to make this 8 watts audio amp.. can u send me the schematic diagram and the PCB Layout of this.. inorder for me to make it easily..

anonymous 8 Watt Audio Amp Saturday, March 17, 2012 2:19:32 PM

i built this amp. . But it produces high howling noise. . Though there is a little signal is there. . Iam new to electronics. And i cant solve this problem. . Pls help me. .

juliud c, horfilla 8 Watt Audio Amp Thursday, January 12, 2012 4:15:07 PM

12volts is the exact powersupply for that audio amplifier.

freddie butch despi 8 Watt Audio Amp Thursday, January 05, 2012 10:34:20 PM

what is the appropriate power supply to be used o that amplifier?

julius c.horfilla BSIE TRADE SCHOOL.MJ CUENCO AVE,CEBU CITY PHILS. 8 Watt Audio Amp Monday, October 24, 2011 7:14:32 PM

i assembled that LM383 8WATTS power amplifier it's a heavy duty and excellent amplifier. in cebu we used audio booster for more power output of that lm383 power amplifier.also connect a tone control bass/treble circuit for best results.

anonymous jhun 8 Watt Audio Amp Saturday, May 15, 2010 8:13:09 PM

very wrong pin configuration. according to the datasheet of the said IC pin-5 is the output but on the schematic diagram pin-8 is the output & pin1 and pin2 is the non inverted and inverted input. please correct the diagram.

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anonymous	8 Watt Audio Amp	Wednesday, September 02, 2015 1:32:57 AM
The above circuit will NOT work as is, due to several reasons: 1.) Biasing resistors missing (Add a 20K ohm from +12V to pin 3, and another one from pin 3 to ground - value NOT super critical. 2.) C2 should really be connected in series with R1 (rather than as shown). 3.) Will NOT get 8 watts out of this design. Even if the signal swings rail-to-rail, the most you can get is 2.25 watts (calculations based on a sine-wave audio signal).
anonymous	8 Watt Audio Amp	Wednesday, October 29, 2014 7:41:30 AM
I dont have the IC LM383 instead I've LM386 will it work?
jayson baluyot	8 Watt Audio Amp	Monday, September 01, 2014 10:15:00 PM
Hi, i'm a new student i'd really like to try this circuit ,but is this circuit really work?
anonymous	8 Watt Audio Amp	Wednesday, June 11, 2014 9:26:47 AM
how does it work? I mean its function...
mark	8 Watt Audio Amp	Wednesday, February 06, 2013 9:27:21 PM
i am only a high school student.. but i really like electronics. that's why i wnt to make this 8 watts audio amp.. can u send me the schematic diagram and the PCB Layout of this.. inorder for me to make it easily..
anonymous	8 Watt Audio Amp	Saturday, March 17, 2012 2:19:32 PM
i built this amp. . But it produces high howling noise. . Though there is a little signal is there. . Iam new to electronics. And i cant solve this problem. . Pls help me. .
juliud c, horfilla	8 Watt Audio Amp	Thursday, January 12, 2012 4:15:07 PM
12volts is the exact powersupply for that audio amplifier.
freddie butch despi	8 Watt Audio Amp	Thursday, January 05, 2012 10:34:20 PM
what is the appropriate power supply to be used o that amplifier?
julius c.horfilla BSIE TRADE SCHOOL.MJ CUENCO AVE,CEBU CITY PHILS.	8 Watt Audio Amp	Monday, October 24, 2011 7:14:32 PM
i assembled that LM383 8WATTS power amplifier it's a heavy duty and excellent amplifier. in cebu we used audio booster for more power output of that lm383 power amplifier.also connect a tone control bass/treble circuit for best results.
anonymous jhun	8 Watt Audio Amp	Saturday, May 15, 2010 8:13:09 PM
very wrong pin configuration. according to the datasheet of the said IC pin-5 is the output but on the schematic diagram pin-8 is the output & pin1 and pin2 is the non inverted and inverted input. please correct the diagram.