Audio Power Amplifier Circuit

Posted on Sep 22, 2012

The circuit, built around an LM741 op amp configured as an inverting amplifier, is used to drive complementary transistors (Ql and Q2). The op amp`s feedback loop includes the base-emitter junctions of both transistorsan arrangement that helps to reduce crossover distortion that would normally occur as-a result of the emitter-to-base junction voltage drop of about 0,6 V.

Audio Power Amplifier Circuit
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Potentiometer R5 varies the amplifier`s voltage gain from 1 to about 20. As much as 0.5 W can be obtained from the circuit if a heatsink is added to the transistors.

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