audio detector to turn on amplifier

Discussion in 'General Electronics Chat' started by jptrsn, Mar 18, 2011.

  1. jptrsn

    Thread Starter Member

    May 3, 2008
    10
    0
    Hi,

    I'm looking for a circuit that would automatically turn on my amplifier when it detects input from a line level. I would be happy to have it pass the signal through, and use a relay in series with the power supply (120VAC).

    Has anyone seen a circuit like this? I haven't found any, either in books or on the web.

    Thanks,
    jptrsn.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
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