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, November 11, 2009 2:58:46 PM

The circuit diagram clearly shows 'R3' and the text refers to 'R3', yet there are only 2 resistors in the component list. (The component list appears to be correct in this). :)

Paul 8 Watt Audio Amp Monday, October 26, 2009 3:22:55 AM

LM383 datasheet found at national.com Condenser mic's are microphones that convert mechanical vibration to electrical signals via vibrating charged parallel plates (condenser -> capacitor). The mic needs biasing because the plates have to have a charge maintained for the thing to function.

Angelo 8 Watt Audio Amp Wednesday, May 27, 2009 6:53:50 AM

The pin connections are all wrong. I tried looking for other circuit diagrams in the internet an it worked.

anonymous 8 Watt Audio Amp Tuesday, April 28, 2009 7:39:13 PM

why do condenser mics need biasing?????????????//

Chris 8 Watt Audio Amp Saturday, January 17, 2009 10:15:41 AM

the connections of the pins of the ic are WRONG! the ic heat up and i have checked over and over but the problem is from the schematic diagram... please help me to solve out this problem!

ZIA 8 Watt Audio Amp Wednesday, November 12, 2008 5:25:20 AM

These pins configration is abslutely wrong

gerard rendon 60 Watt Audio Amp Monday, April 07, 2008 12:59:40 AM

im doingin a project on 60watt audio amplifier,how do i go about it?

anonymous 8 Watt Audio Amp Friday, March 07, 2008 1:16:29 AM

the circuit is wrong,pin numbers do not match the specification sheet

chaminda 8 Watt Audio Amp Saturday, March 01, 2008 11:55:08 AM

Pl Chek LM383 Pinout. Pin No .4 is Ground. But Curicuit Pin No. 04 is OutPut. It Rong.

Audioguru 8 Watt Audio Amp Wednesday, February 06, 2008 4:57:15 PM

This IC is obsolete and has not been made for 12 years. The pins numbers on the schematic are completely wrong. The schematic is missing important parts. Make the circuit on the datasheet of the TDA2003 instead. It is available, shows all the parts and even shows a pcb design.

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anonymous	8 Watt Audio Amp	Wednesday, November 11, 2009 2:58:46 PM
The circuit diagram clearly shows 'R3' and the text refers to 'R3', yet there are only 2 resistors in the component list. (The component list appears to be correct in this). :)
Paul	8 Watt Audio Amp	Monday, October 26, 2009 3:22:55 AM
LM383 datasheet found at national.com Condenser mic's are microphones that convert mechanical vibration to electrical signals via vibrating charged parallel plates (condenser -> capacitor). The mic needs biasing because the plates have to have a charge maintained for the thing to function.
Angelo	8 Watt Audio Amp	Wednesday, May 27, 2009 6:53:50 AM
The pin connections are all wrong. I tried looking for other circuit diagrams in the internet an it worked.
anonymous	8 Watt Audio Amp	Tuesday, April 28, 2009 7:39:13 PM
why do condenser mics need biasing?????????????//
Chris	8 Watt Audio Amp	Saturday, January 17, 2009 10:15:41 AM
the connections of the pins of the ic are WRONG! the ic heat up and i have checked over and over but the problem is from the schematic diagram... please help me to solve out this problem!
ZIA	8 Watt Audio Amp	Wednesday, November 12, 2008 5:25:20 AM
These pins configration is abslutely wrong
gerard rendon	60 Watt Audio Amp	Monday, April 07, 2008 12:59:40 AM
im doingin a project on 60watt audio amplifier,how do i go about it?
anonymous	8 Watt Audio Amp	Friday, March 07, 2008 1:16:29 AM
the circuit is wrong,pin numbers do not match the specification sheet
chaminda	8 Watt Audio Amp	Saturday, March 01, 2008 11:55:08 AM
Pl Chek LM383 Pinout. Pin No .4 is Ground. But Curicuit Pin No. 04 is OutPut. It Rong.
Audioguru	8 Watt Audio Amp	Wednesday, February 06, 2008 4:57:15 PM
This IC is obsolete and has not been made for 12 years. The pins numbers on the schematic are completely wrong. The schematic is missing important parts. Make the circuit on the datasheet of the TDA2003 instead. It is available, shows all the parts and even shows a pcb design.