Active line indicator

Article View: mod.telecom

Article #160

#160

From: Ole Jorgen Jacobsen
Date: Sat, 19 Oct 1985 06:57

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SRI International: (415) 859-4536  Home: (415) 325-9427
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I'd like to build a simple circuit that will turn on an LED
when a phone line is active. The circuit should be powered
by the telco line, withstand ringing voltage and preferably
be small enough so as to be mounted behind the RJ11 modular
faceplate. The idea is to be able to see that a phone line
is in use without picking up another instrument to listen
(and cause havoc to a modem/computer). Any smart hardware
hackers out there?

<OLE>
<370>
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Path: arc1-ca.pugleaf.net!utzoo!decvax!decwrl!ucbvax!sri-nic.arpa!OLE
From: OLE@SRI-NIC.ARPA (Ole Jorgen Jacobsen)
Newsgroups: mod.telecom
Subject: Active line indicator
Message-ID: <8510210350.AA26110@UCB-VAX>
Date: Sat, 19-Oct-85 02:57:46 EDT
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Posted: Sat Oct 19 02:57:46 1985
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