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Question about switches....

Discussion in 'Electronic Basics' started by Michael Heath, Dec 12, 2003.

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  1. I'm trying to set something up so that when there is a sound signal on
    a certain wire a switch is activated. Is this possible at all? What
    would I need to do it?
  2. Ross Mac

    Ross Mac Guest

    When you say "sound signal"...what is it you mean. Do you mean you would
    like an audio signal to turn on a light or just a noise...A little more info
  3. Its actually an audio signal...I suppose that your "audio signal to
    turn on a light" is closest to what I'm trying to do. I'm working on
    some audio equipment that automatically transmits an audio signal via
    radio signal if there is an audio signal to submit - since you can't
    simultaneously send/receive radio at the same time on once freq., I
    need to have it only transmit when theres something to transmit (Its a
    2-way radio setup...basically it receives when theres nothing to send)

  4. Ian Stirling

    Ian Stirling Guest

    <snip quoted message incorrectly placed at bottom>
    Search on "voice activated microphone".
    Some radio equipment does this automagically.
    This may be a more appropriate topic for one of the radio newsgroups.
    There may be a microphone you can buy that will plug into your radio
    and do what you want.
  5. Brian Oakley

    Brian Oakley Guest

    Yes, this is called VOX operation, or Voice Operated Relay. Depending on
    what kind of radio you are using, there are many commercially made units
    that plug into the microphone jack. If you are looking to build a circuit,
    it should be fairly easy to find one on the internet or in the Amateur Radio
    Handbook by the ARRL. Give those a shot.
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