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'[OT]: PBX using a PIC micro'
2002\03\05@182529 by Gabriel Caffese

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Hello there,

 I want to share 16 "internal" telephone to 4 "external" telephone lines.
The internal phones will only try to get one external line, as to make a
communication to the outside world, but want ever try to communicate to
another internal phone.
 I will also have to know how much time did that communication last, and
wich number was dialed.
So, here comes the question:

  Does anyone know wich analog circuits would simplify my job ? (DTMF
dialer, etc, etc)

  Hope to receive help,


              Gabriel Caffese.-

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2002\03\05@191754 by Bob Blick

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These guys have ring generators and LOTs of great information.

http://www.camblab.com/lit/lit.htm

Cheers,

Bob

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2002\03\05@192206 by Bob Barr

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On Tue, 5 Mar 2002 20:31:16 -0300, Gabriel Caffese wrote:

>
>   Does anyone know wich analog circuits would simplify my job ? (DTMF
>dialer, etc, etc)
>

Take a look at Teltone Corp: http://www.teltone.com
They have a lot of telecom related ICs: DTMF generators, DTMF
detectors, call progress tone detectors and sense relays.

Their app notes are pretty good as well.


Regards, Bob

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2002\03\06@062628 by zantos

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www.epanorama.net/telephone.html#circuits

is a good start. I did something very similar with a PIC16F873, HT9170 DTM
decoder.
HTH

{Original Message removed}

2002\03\08@211603 by Patrick J

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that url / server seems dead to me... anyone got it working ?


From: "zantos" <spam_OUTzantosTakeThisOuTspamICLWAY.CO.UK>
> www.epanorama.net/telephone.html#circuits
> is a good start. I did something very similar with a PIC16F873, HT9170 DTM
> decoder.
> HTH

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