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Telephone Dialer

Hi,

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

Thanks

Reply to
dereklai2k
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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

Reply to
Josh

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