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7W Mini Audio Amplifier Circuit based LM383



This is a very-very simple mini audio amplifier circuit. The circuit build based single LM383 with several discrete circuit to support LM383. The circuit capable to deliver about 7W audio output.

7W Mini Audio Amplifier Circuit based LM838



Notes for 7W Mini Audio Amplifier Circuit based LM838:
  • VS = 20V max, speaker 4 Ohm
  • IC1 Ought to be installed on a heat sink.
  • C3 is for filtering and to prevent oscillation and really should not be omitted.
  • The circuit could 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 stop oscillation.
  • By swapping the values of R1 and R3, you are able to turn this amplifier into a guitar amp with no preamp required.
  • In the event you add a 0.2uF capaciitor in series with a 1 ohm resistor to the output you'll be able to prevent oscillation of the circuit under specific conditions.
  • Substitutions for LM383 are ECG1232, TDA2002. You may use those ICs if you didn't find LM383. Please check the datasheet first.
Download LM383 datasheet for your project reference.

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