Explain how a center tap push - pull gdt works?

dr pepper said:

The lack of a resonant cap across the trans means this is a driven rather than a resonant design.

Putting audio on the rt connection of the '3525 will cause the o/p to be frequency modulated, in turn causing the o/p of the transformer to change generating a sound wave.

The system would be more effecient is it was made resonant, however it would also be more complex.

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dr pepper said:

Yes thats the one.
I built one of those things, my original driven non resonant circuit pulled loads of amps and eventually killed the fets, the resonant (I think they call it a royer circuit) pulled 50ma without an arc, and a couple of amps with an arc, and the fets didnt change temperature.
The only thing is getting audio out of it isnt straightforward, fm might be possible if you shunted the parallel capacitance, allthoughthis would reduce efficiency as the shunt device would also dissispate some of the drive current, maybe you could interfere with the gate drive of the fets.
There are some smpsu controllers that are quasi resonant, one of these might be a good idea, although I suspect there will be a bit of messing about getting it to work well.

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