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[aprssig] DTMF Decoder chips

Brian B. Riley brianbr at mac.com
Thu Aug 16 23:05:25 UTC 2007

A number of people have asked me where I get my DTMF decoder chips I  
have referred to in some of my writings and have demonstrated in my  
presentations. My general answer is ".. wherever and whenever i can  
find them" ... they are, for some reason, scarce. There are  
references all over but few people carry them and mots that do want  
orders in multiples of 1000's ...

To keep this from getting too long. I just scored 50 of the Clare  
MT8870D in 18 pin DIP. They aren't very expensive. I am offering them  
in small quantities as a 'complete kit' (chip, 18 pin socket, color  
burst crystal, three precision resistors and 2 caps) for $5 plus $2 S/ 
H through my website. No bulk sales, limit three kits to a customer.

I have found this to be a rock solid chip.  I regularly use these   
over VHF/UHF FM for remote control and they work very well.  
Programming is trivial, loop and test one data_valid bit and then  
read 4 data  bits. Basic Stamp, AVR, PIC, Arduino, you name it. The  
DataSheet is available from my website also.


cheers ... 73 de brian  riley,  n1bq , underhill center, vermont
   <http://web.mac.com/brianbr/>  Tech Blog
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