Want to build modem carrier detect circuit.

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Article #16103

#16103

From: Stuart R Ehrlich
Date: Mon, 04 Jan 1993 13:36

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I want to build a 'carrier detect' circuit to go on my phone line.  I
have several computer systems and several modems, but all on the same
line, so only 1 is in use at any time (1 at the most).  The modems are
1200/2400 baud.  I would like to have a single indicator that would
indicate the presence of a carrier on the phone line.  I _DON'T_ want a
'phone line in use' indicator; I already have one.  I want a new
indicator for when a modem is active.  Can I use a portion of some modem 
IC, just to use it as a carrier detector?  I would appreciate any tips or 
schematics.  Thanks!

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Newsgroups: sci.electronics,comp.dcom.modems
Path: arc1-ca.pugleaf.net!sparky!uunet!world!ehrlich
From: ehrlich@world.std.com (Stuart R Ehrlich)
Subject: Want to build modem carrier detect circuit.
Message-ID: <C0C0G4.9MH@world.std.com>
Organization: The World Public Access UNIX, Brookline, MA
Distribution: usa
Date: Mon, 4 Jan 1993 13:36:03 GMT
Lines: 9