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Is there a way use headphone audio to trigger a DC circuit?

Discussion in 'Audio' started by timelake, May 4, 2013.

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  1. timelake


    May 4, 2013
    Is there a way adapt the headphone output audio and use it as a switch?
    So that a peak audio signal appears at the jack it will trigger a DC circuit.
    Is there a simplified approach, without the use of computer chips, etc?
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    You can use a rectifier and a filter capacitor to detect peak audio output voltage e.g. by a Schmitt-trigger circuit. The output from the Schmitt-trigger can be used for various purposes.

    Why does it have to be an audio output? If it's a PC you're talking about, you can use one pin of the parallel port (if there is one) or use a simple USB to parallel converter to achieve the same.
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