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Power switch kuh - thump !!!

Discussion in 'Electronic Basics' started by fffcj, Aug 23, 2004.

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  1. fffcj

    fffcj Guest

    I have a guitar preamp ( Marshall JMP-1 ) .
    When it powers up , there is very loud Kuh - thump on the output .
    How do I modify it to get rid of this annoying trait ?


  2. Gene

    Gene Guest

    Connect the contacts of a suitable relay in series with the amp output and
    have a delayed turn-on of the relay (few seconds), in other words he
    contacts are connecting the speaker to the amp output only after the
    power-on transients have subsided.. This works fine only if the amp output
    stage is in push-pull configuration.
  3. 1: OP said its a preamp so it might be turned on independently of the amp.
    2: My real question-- why won't your relay solution work with a single ended amp?

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