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From: tad@ssc.UUCP (Tad Cook)
Newsgroups: comp.dcom.telecom
Subject: Re: DTMF Decoder Wanted (or Chips/Schematics)
Message-ID: <14326@accuvax.nwu.edu>
Date: 5 Nov 90 00:05:18 GMT
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In article <14220@accuvax.nwu.edu>, aardvark!steve@tessi.uucp (Steve
Willoughby) writes:

> The problem is that I can't seem to find any references to
> DTMF-decoder chips or schematics of discrete-component circuits to do
> this function.  Any help would be appreciated.

Check with Teltone.  They sell touchtone receivers.  You could also
talk to SSI (Silicon Systems), although I don't remember their
address.  They are in southern California.  There is an application
circuit for the SSI chip on page 34-3 of the 1990 ARRL Handbook.

Stay away from circuits in the older ham radio literature that use
567s and discrete components.

Here is how to get in touch with Teltone:

Teltone Corp.
10801 120th Ave. NE
Kirkland, WA  98033

206-827-9626


Tad Cook   Seattle, WA   Packet: KT7H @ N7HFZ.WA.USA.NA  Phone: 206/527-4089 
MCI Mail: 3288544        Telex: 6503288544 MCI UW  
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