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'[EE]: Telephone interface to stereo'
2001\02\15@180452 by Richard Sloan

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Any telcom experts out there?

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)

The telephone set would not be connected to the phone company.

Thanks!

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2001\02\15@211556 by Gordon Varney

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>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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2001\02\16@042352 by Jane Ifurung

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I'm not sure of the web site but i think you could get
some idea from tomi engdahl's telephone page.

regards,
jane

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2001\02\16@071913 by Max Toole

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In a message dated 2/16/01 4:26:06 AM Eastern Standard Time,
jane_ifurungspamspam_OUTYAHOO.COM writes:

> >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)
>  >
You may want to consider just using a telephone handset because it has
separate mic and speaker.  However, if you must use the whole telephone, you
will need a current source for loop current and then a speech circuit to
convert from 2-wire to 4-wire.  The speech circuit that I use is the Motorola
MC34014P.

Hope this helps,
Max

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2001\02\16@105746 by Richard Sloan

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Thanks!

R.

 >>  In a message dated 2/16/01 4:26:06 AM Eastern Standard Time,
 >>  @spam@jane_ifurungKILLspamspamYAHOO.COM writes:

 >>  > >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)
 >>  >  >
 >>  You may want to consider just using a telephone handset because it has
 >>  separate mic and speaker.  However, if you must use the whole telephone,
 >>   you
 >>  will need a current source for loop current and then a speech circuit to
 >>  convert from 2-wire to 4-wire.  The speech circuit that I use is the
 >>   Motorola
 >>  MC34014P.

 >>  Hope this helps,
 >>  Max

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