> >Looking for a schematic to be able to connect a
> telephone set to and be
> able to have line in >and line outs from the
> telephone.
>
> >Basically I should be able to connect the telephone
> to my stereo and use it
> as a speaker and >a mic! (all at line level ins and
> outs)
>
> No not exactly. The telephone is full duplex, and
> will require about 10 to
> 20 Vdc to function correctly. You may however
> provide taps internally to use
> the mic and a low level amp to drive the speaker.
> Separation is a must, your
> stereo is not full duplex through the same wires.
> You may be able to make a
> transformer circuit that will provide DC for the
> phone and isolate the
> stereo from the DC. Impedance matching will be
> important, 600 ohms for the
> telephone and LOW impedance for the stereo, I am not
> sure of the correct
> impedance for the stereo. Again you can not run full
> duplex audio to the
> stereo, major feedback problems.
>
> Gordon Varney
>
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