voice activated relay

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Discussion in 'The Projects Forum' started by glenwanda, Feb 10, 2011.

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  1. Feb 10, 2011 #1
    glenwanda

    Thread Starter New Member

    Aug 25, 2010
    3
    0
    Need a schematic for a voice activated relay. 9vdc. momentary on then off.
    Hope someone can help me.
    glenwanda
     
    #1 Reply
  2. Feb 11, 2011 #2
    nerdegutta

    Moderator

    Dec 15, 2009
    2,674
    911
    Hi.

    Just thinking....

    A microphone picks up some sound. It will trigger a 555, monostable timer, and the timer will activate the relay. After a period of time, the 555 time-out, and the gos off.

    Something like that?


    After a quick google I found this:

    [​IMG]
     
    #2 Reply
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