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

Schematic for amp

LM383 Pinout

Pinout for LM383 audio amp IC

Parts
Part
Total Qty.
Description
Substitutions
C1110uf Electrolytic Capacitor
C21470uf Electrolytic Capacitor
C310.1uF Disc Capacitor
C412000uf Electrolytic Capacitor2200uF
R112.2 Ohm ResistorAnything Within 10%
R21220 Ohm ResistorAnything Within 10%
IC11LM383 8 Watt Amp ICECG1232, TDA2002

Notes

  1. IC1 MUST be installed on a heat sink.

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

  3. 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.

  4. The circuit draws about 880 ma at 12 V.

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

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

  7. 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.

  8. 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

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This IC is obsolete and has not been made for 12 years.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.
joyce
8 Watt Audio Amp
Wednesday, January 23, 2008 3:39:18 AM
can u send to me the explanation and calcution for this circuit
natal edmund
60watt audio amplifier
Thursday, January 10, 2008 7:17:00 AM
i am invovled in a project on 60watt audio amplifier,how do i go about it?
anonymous
8 Watt Audio Amp
Tuesday, January 08, 2008 4:04:12 AM
its a great amp and really useful but rubish too
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