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From: jvz@cci632.UUCP (John V. Zambito)
Newsgroups: comp.dcom.telecom
Subject: Submission for comp-dcom-telecom
Message-ID: <8704201418.AA01527@cci632.UUCP>
Date: Mon, 20-Apr-87 09:18:35 EST
Article-I.D.: cci632.8704201418.AA01527
Posted: Mon Apr 20 09:18:35 1987
Date-Received: Sat, 25-Apr-87 13:20:38 EST
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Path: cci632!jvz
From: jvz@cci632.UUCP (John V. Zambito)
Newsgroups: comp.dcom.telecom
Subject: Re: Telephone Ring Detection
Message-ID: <1132@cci632.UUCP>
Date: 20 Apr 87 14:18:34 GMT
References: <8704150611.AA25473@ucbvax.Berkeley.EDU>
Reply-To: jvz@ccird1.UUCP (John V. Zambito)
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Organization: CCI, Communications Systems Division, Rochester, NY
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In article <8704150611.AA25473@ucbvax.Berkeley.EDU> JEL@PSUVM (Jon Loos 814/238-6649) writes:
>detect the ring signal on a telephone line?  What I want to do is build a
>simple box that would plug into my equalizer input or output lines, and also
>the phone lines.  When the phone rings, it would can the stereo, so that I

The part you want is the TI TCM1520A. I got one as a somple from the local
TI rep. I hooked it up through a FET to drive a relay. The relay can be used 
to switch a light or cut out the speakers or turn on a loud horn, etc......
It only loads the line while the phone rings, and only about a milliamp.
The app. note in the TI telecomm products data book is very helpful.