Article View: sci.electronics
Article #17819Re: DTMF
From: Ron Pluth
Date: Sat, 18 Jul 1987 18:56
Date: Sat, 18 Jul 1987 18:56
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You can pick up a simple DTMF decoder chip at Radio Shack for $10.95. It
outputs in straight binary for either the normal 12 digits or for all 16. I
think it might also output in some other format, like Gray code, or something.
It takes, as has been mentioned, a cheap crystal, and I think it takes straigt
audio inputs. Of course, you must be careful in interfacing it directly to a
telephone line, as ring voltages run up to ~150 VAC.
Ron Pluth
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!uunet!seismo!husc6!bloom-beacon!think!ames!sdcsvax!ucsdhub!jack!man!crash!pnet01!rpluth From: rpluth@pnet01.CTS.COM (Ron Pluth) Newsgroups: sci.electronics Subject: Re: DTMF Message-ID: <1405@crash.CTS.COM> Date: Sat, 18-Jul-87 14:56:23 EDT Article-I.D.: crash.1405 Posted: Sat Jul 18 14:56:23 1987 Date-Received: Sun, 19-Jul-87 06:35:43 EDT Sender: news@crash.CTS.COM Organization: People-Net [pnet01], El Cajon, CA Lines: 15