Thompson.PA@XEROX.COM.UUCP (04/17/87)
Re: Date: Fri, 10 Apr 87 11:55 EDT From: <JEL@PSUVM> (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
brian@casemo.UUCP (Brian Cuthie) (04/20/87)
In article <870417-100022-2409@Xerox>, Thompson.PA@XEROX.COM writes: > I think that the one that Radio Shack sold is the Texas Insturments > TCM1520A > Yea, but just try to get some. It took me over three months to get 18 of the things from a local distributor. I tried everyplace I could think of (major firms [ie. Hallmark, Hamilton, Arrow, etc]) and they all quoted lead times of 12 to 16 weeks from TI. It seems that everybody is using this chip and there just aren't any around. It's a great chip, but if you can't reliably get it what doog is it ??? Regards -Brian ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ARPA: brian@umd5.umd.edu USENET: ...!seismo!mimsy!brian@umd5.umd.edu