That is using non complementary pairs of N-channel,only, mosfets. Can anyone direct me to a useful primer for such designs , with "bias" to repair considerations, eg powering up suspect/half repaired such amps with reduced power rail levels - what effects to expect or even if its possible ? both-on possibilities etc
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
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Well, other than mosfets usually go short circuit when they fail, no mate!
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For a stereo pair of class D switching amps, +&-rails driven from 2 switch mode power supplies, one - , one+, would they all be tied to the same frequency, to avoid beats? Anyone know if thats the case?
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
would such beats become audible?
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I can find plenty on design of such amps but not the practical implications , let alone repair of such amps. If one was at 50KHz and the other 51KHz or so, or one 50KHz and the other 251KHz or so , at high power levels, could there be some annoying beat effect ? either from the internal wiring/transformers or in the output audio
-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on
on
Usually MOSFETS go, test and replace them as necasary.
After that I would send the amp to an expert engineer before you blow yourself up !
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