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A little help here

Discussion in 'Electronic Basics' started by [email protected], Sep 22, 2006.

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  1. Guest

    Hey, I was wondering if it was possible to connect a phone to the
    computer to use as a microphone ? Ya know, a regular house phone . I've

    connected the phone to one of the lines and am lost as to what to do
    next if this feat is even possible.
  2. Bob Masta

    Bob Masta Guest

    The phone is expecting to be dealing with a 48 VDC phone line.
    Even assuming you came up with the 48 volts from somewhere, the output
    level of the audio signal will be much larger than that from a mic
    alone... though it might work on a Line input. But unpowered,
    I doubt you'll get anything at all. The really old-time phones used
    a variable-resistance carbon button mic that essentially acted
    like a variable resistor in series with the DC supply. The modern
    phones use an electret mic that also needs a supply, but just a
    few volts. Your phone will be expecting to divide the 48V supply
    by 10 or so to run the mic, plus there is other electronics that will
    need power in there.

    Best regards,

    Bob Masta

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    Home of DaqGen, the FREEWARE signal generator
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