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Article #20567Re: DTMF (Touch-Tone) --> RS-232 Conversion
From: Keith J. McQueen
Date: Fri, 27 Jan 1989 19:07
Date: Fri, 27 Jan 1989 19:07
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Myself along with a group from our local Ham Radio ARES group has designed a DTMF decoder circuit that we use for DTMF signalling, remote control and paging. One of the many features it incorporates is a CMOS level ASCII serial output (RS-232 but 5v levels) of all tones recieved. The project uses a microprocessor for control, and draws about 12 microamps when no audio is present. Costs about $50 to build. This could be what you are looking for.
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!lll-winken!oodis01!uplherc!wicat!m5!keith From: keith@m5.UUCP (Keith J. McQueen) Newsgroups: sci.electronics Subject: Re: DTMF (Touch-Tone) --> RS-232 Conversion Message-ID: <00106@m5.UUCP> Date: 27 Jan 89 19:07:32 GMT Organization: WICAT Systems Inc. Orem, Utah (Engineering-R & D) Lines: 10