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Trimodal audio power, Part I

This project had its roots in a large number of requests for a PCB for the Class-A amplifier described in the last part of the Distortion In Power Amplifiers series. Rather than just using the original circuit, I took the chance to look closely at output stage voltage efficiency, and also to re-examine the input stage balance and noise performance. I added a safety circuit to prevent catastrophe if the quiescent-current control arrangements went haywire, and this very conveniently doubles as the bias voltage generator when the amplifier is in the Class-B mode.

This proved a very popular design, and I had a lot of correspondence about it. People are still building them.

I present here my own contribution to global warming ...

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