Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!ames!ucbcad!ucbvax!XEROX.COM!Thompson.PA From: Thompson.PA@XEROX.COM.UUCP Newsgroups: comp.dcom.telecom Subject: Re: TELECOM Digest V6 #31 Message-ID: <870417-100022-2409@Xerox> Date: Fri, 17-Apr-87 12:00:20 EST Article-I.D.: Xerox.870417-100022-2409 Posted: Fri Apr 17 12:00:20 1987 Date-Received: Sun, 19-Apr-87 12:05:26 EST Sender: daemon@ucbvax.BERKELEY.EDU Distribution: world Organization: The ARPA Internet Lines: 29 Approved: telecom@xx.lcs.mit.edu Re: Date: Fri, 10 Apr 87 11:55 EDT From: (Jon Loos 814/238-6649) Subject: Telephone Ring Detection Is it just my imagination, or did Radio Shack used to sell a chip that would detect the ring signal on a telephone line? I think so, don't know whether or not they still do. There certainly are a number of chips on the market that will do that. You could also do it with a with an electronic ring generator chip of which there are several. I think that the one that Radio Shack sold is the Texas Insturments TCM1520A A brief description of it appears on pg 13 of TI's Telecom Circuits Selection Guide, 1983 VLSI/LSI for Telecom Applications Good luck Geoff Geoff Thompson Thompson.pa@Xerox.COM 475 Oakmead Pkwy (408) 737-4690 Sunnyvale, CA 94086