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An idea I need help with

Discussion in 'Electronic Design' started by Joel Sandler, Jul 24, 2003.

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  1. Joel Sandler

    Joel Sandler Guest

    I have a GPS unit with an audio output (stereo) and a car stereo with a
    GPS/Phone input. The GPS input is switched thru the ground, when the ground
    is opened the audio mutes and the GPS audio is played over the speakers.
    How can I create a switch the senses the audio, opens the ground and allows
    the audio thru?

    Any help is appreciated.
  2. Joel Sandler

    Joel Sandler Guest

    Tap tap tap? Anyone?
  3. It sounds like you want the GPS audio to be sensed and allow it to key
    itself through- is this correct?
    Look at VOX circuits. They key on voice. Wire the GPS audio output to the
    input of the VOX circuit. Use a capacitor to couple it to maintain isolation.
    The output of the VOX can then be used to drive any relay, given a small
    transistor. That relay can then be wired to break your ground connection.


    Chip Shults
    My robotics, space and CGI web page -
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