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FET complimentary buffer?

post #1 of 3
Thread Starter 
Is there a simple FET complimentary buffer? Something like the BJT diamond stuff... but with fets. I like to run deep Class A.. 60-70ma quiescent, and that doesn't seem possible with most of the diamond buffers out there. And I'm so lousy with BJT design I wouldn't know where to begin after changing the output devices.

Thanks
post #2 of 3
From my understanding, and also from ones that I've built - the level of heat rejection is the only thing stopping Diamond Buffers from running >50ma. I'm running ~45ma per in the MH Max, and I'm sure they'll do twice that without a problem. IOW, design your circuit for extruded heat sinks on the output.
post #3 of 3
I don't know of any reason a diamond buffer couldn't be biased into class A as much as you are looking for. A simple tweaking of the first stage bias current and the ratio of the emitter resistors should yield the results you are looking for.
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