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Interfacing an Intercom system to a PC sound card

Discussion in 'Electronic Basics' started by Dan Burke, Sep 28, 2003.

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  1. Dan Burke

    Dan Burke Guest

    I'm looking for some real basic audio circuit help. I have very little
    electronics knowledge.

    I have a Music and Sound System Intercom unit model MC111M. I would
    like to run the output signal from the Intercom system into the
    line-in of a PC sound card.
    I have no circuit diagrams and no clear understanding of how the
    circuit works.

    Anyone have any useful thoughts?

    If you're qualified and charge a reasonable rate, I'd condider
    contracting to have a MC111M room station modified to support an audio
    out that would be suitable for a line in run.

  2. Dan Burke

    Dan Burke Guest

    (Dan Burke) wrote in message
    Some more information:

    The speaker is 45 ohms (I guess that's standard for a commercial
    The speaker acts as the mic too (also standard).

    There are 4 wires that run to the room stations. I believe 2 of them
    are the audio feed (red/green). When I put a volt meter on these I get
    a range of
    3 to 7 millivolts (.003/.007). I believe the other 2 wires are power
    and common ground (black and white). When I put a volt meter on these
    I get a near constant of 10.6 volts.

    The voltage seems very low compared to what I've read on this board
    from messages where others have tried to interface the speaker out
    from a stereo to a line-in.

    Thanks for any advice.
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