SZ123

FM Transmitter Lovers

LM383 8 Watt Audio Amp

By SZ123 • 2009-05-15 • Category: Audio Diy • RSS 2.0 • Trackback •

Here is the LM383 schematic for an 8 watt audio amp. Very easy to build a mini-audio power amplifier.

lm383

lm383_2

Part
Total Qty.
Description
Substitutions
C1 1 10uf Electrolytic Capacitor  
C2 1 470uf Electrolytic Capacitor  
C3 1 0.1uF Disc Capacitor  
C4 1 2200uf 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

  • 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 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.

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