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Telephone Dialer

Discussion in 'Electronic Design' started by [email protected], Dec 19, 2004.

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  1. Guest

    Hi,

    Do anyone know how to creat a telephone dialer (interface with 2 wires)
    with a DTMF generator?

    Thanks
     
  2. You're welcome. :)
     
  3. Rich Grise

    Rich Grise Guest

    You might check some of these links:

    http://www.google.com/search?q=dtmf+dialer

    Good Luck!
    Rich
     
  4. Josh

    Josh Guest

    There are two ways of doing this, the first which I don't have much
    experience with goes like this. Normally accross a telephone line there's
    50volts, you just stick a bit of resistance between the two wires so the
    voltage drops to a few volts and chuck a signal down it. The other way is to
    stick a transformer accross it (with a resistance on it's coils enough to
    drop the voltage to a few volts) and stick your signal on the other side.

    Josh
     
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