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Class D (switch mode) unipolar mosfet audio amps

Discussion in 'Electronic Repair' started by N Cook, Jun 3, 2007.

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  1. N Cook

    N Cook Guest

    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
  2. Guest

    Well, other than mosfets usually go short circuit when they fail, no
  3. N Cook

    N Cook Guest

    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?
  4. Guest

    would such beats become audible?

  5. N Cook

    N Cook Guest

    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
  6. Marra

    Marra Guest

    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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