250mW audio amplifier

Posted on Feb 7, 2014

Here is a very simple three transistor audio amplifier circuit that can deliver 250mW to a 8Ohm speaker. Complementary transistors BC337 and BC227 (Q3 and Q2) are used as the output pair. Transistor Q1 (BC 547) acts as the preamplifier. POT R5 can be used as a volume control. Capacitor C1 decouples the DC from the audio source. Resistor R2 ensures

250mW audio amplifier
Click here to download the full size of the above Circuit.

better stability for the amplifier. This amplifier is very suitable for application in small radio sets and as a preamplifier in high power audio amplifiers.

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