Power amplifiers usually cause the most problems, this one is no exception.
I retrieved some cores from a PC power supply. They seem to work. For the time being the amplifier uses 2 IRF510 mosfets. I will switch to more powerful types later. The amplifier should work in class D. The amplifier puts out 30 Watts but efficiency is low 60%.
The problem seems to be the mosfet drivers. I tried to drive them directly from TTL at 6 Volts. It did work but efficiency was 40% or less. Then I tried 2 driving transistors. That improved the efficiency but it is still not good enough. I will try TC4427 drivers.
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