Phone Line Simulator Circuit

Richard Kozlowski

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Mar 27, 1995, 1:58:37 AM3/27/95

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Does anyone know where I can find the schematics to build a phone line
simulator? So far, the lowest price I could find to purchase one is $80.
Surely, I could build one for much less!
Thanks!

R. C. Lacovara

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Mar 28, 1995, 12:03:26 PM3/28/95

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In article <3l5nmt$g...@ixnews3.ix.netcom.com> ric...@ix.netcom.com (Richard Kozlowski) writes:
>From: ric...@ix.netcom.com (Richard Kozlowski)
>Subject: Phone Line Simulator Circuit
>Date: 27 Mar 1995 06:58:37 GMT

I posted one 6 or 8 weeks ago, and I'll do so again. There's no ring
generator, however, just the line voltage and some transformers to get audio
in and out without the DC. I connected phones using this circuit for all sorts
of testing at one time.

The transformers, and the circuit, BTW, are Microtran. Their data sheets have
the circuit on them.

I'll post them later today as a UU(Zip(postscript)) unless you can accept the
postscript via E-mail.

Bob
R. C. Lacovara, Ph. D.
Electrical Engineer in Computer Science drag...

GeoControl Systems voice: 713 333 2561
Suite 100 fax: 713 333 2966
1720 NASA Road 1
Houston, Texas 77058

JOHN PHIPPS

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Mar 28, 1995, 1:43:01 AM3/28/95

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I could SWEAR that I saw a "How To ......" article in Radio/
Electronics a few months back. Look in recent copies in local
library. If I stumble into it, will email.

Dan Hoehnen

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Mar 28, 1995, 1:30:28 PM3/28/95

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Richard Kozlowski (ric...@ix.netcom.com) wrote:
: Does anyone know where I can find the schematics to build a phone line

: simulator? So far, the lowest price I could find to purchase one is $80.
: Surely, I could build one for much less!
: Thanks!

The summer '94 issue of The Electronics Experimenter's Handbook magazine
has an
article on page 32 to build a phone line simulator. I believe the same
article also ran in the same mag in the summer of '93.

It shows a schematic that looks pretty simple, but uses a proprietary
ring generator. I have one and it works great. I use it to test out
some pc based voice mail software I am writing. This device lets me
"call" my pc without actually having a second phone line, or actually,
without using any phone line.

The complete kit is listed for $79.95, but I don't know if it is still
available. That's still 80 bucks, but maybe the schematic will help you
in your design.

--
Dan Hoehnen
dhoe...@infinet.com
He who dies with the most toys, wins!

John Lundgren

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Mar 29, 1995, 12:25:04 AM3/29/95

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R. C. Lacovara (laco...@csn.org) wrote:

: In article <3l5nmt$g...@ixnews3.ix.netcom.com> ric...@ix.netcom.com (Richard Kozlowski) writes:
: >From: ric...@ix.netcom.com (Richard Kozlowski)
: >Subject: Phone Line Simulator Circuit
: >Date: 27 Mar 1995 06:58:37 GMT

: > Does anyone know where I can find the schematics to build a phone line
: >simulator? So far, the lowest price I could find to purchase one is $80.
: >Surely, I could build one for much less!
: > Thanks!

I bought one from Graybar, it's a model DLE-200A and was made by Viking
Electronics. The price was less than a hundred. It rings regular 2500
Bells sets Ok, but the dial tone sounds a bit raspy. It's about the size
of a pack of cigarettes, but that doesn't include the AC adapter. If you
can get one for $80, buy it. That's cheap.

Hey, Bob. Email me a copy of the schematics, too, if possible and you
don't mind. Thanks. I'd like to check them out.

: I posted one 6 or 8 weeks ago, and I'll do so again. There's no ring

: generator, however, just the line voltage and some transformers to get audio
: in and out without the DC. I connected phones using this circuit for all sorts
: of testing at one time.

: The transformers, and the circuit, BTW, are Microtran. Their data sheets have
: the circuit on them.

: I'll post them later today as a UU(Zip(postscript)) unless you can accept the
: postscript via E-mail.

: Bob
: R. C. Lacovara, Ph. D.
: Electrical Engineer in Computer Science drag...

Derek

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Mar 29, 1995, 2:41:35 AM3/29/95

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Check out Electronics Now, August `93.

Christian Kral

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Mar 31, 1995, 3:00:00 AM3/31/95

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Could you all please post the circuit (if it is really that simple and
doesn't need too much bandwith) here or at least announce a pointer to
an appropriate FTP-site. I am sure that's of general interest and saves
you from mailing to a hundred people.

Thanks in advance,

Christian.
--
Christian Kral . Dept. of Automation . University of Technology Vienna .
Treitlstr. 3, 1040 Vienna . AUSTRIA . phone: +43 1 58801 8188 .
fax: +43 1 5863260 . email: c...@eiaut2.tuwien.ac.at