This is a simple amplifier for boosting the audio level from low-power sound cards or other audio sources driving small speakers like toys or small transistor radios. The circuit will deliver about 2 watts as shown. The parts are not critical and substitutions will usually work.
Simple Computer Audio Booster Circuit Diagram
The two 2.2 ohm resistors may be replaced with one 3.9 ohm resistor in either emitter.
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