Posted on Mar 21, 2013

This amplifier delivers 20 W into an 8-D load using a single IRF520 driving a transformer coupled output stage. This circuit is similar to the audio output stage used in many inexpensive radios and phonographs.

Click here to download the full size of the above Circuit.

Distortion is less than 5% at 10 W, using very little feedback (3%), with the IRF520 biased at 3 A.

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