BG Micro sells DTMF decoders for as low as $ 0.50 / piece, the 8870 are $
4.00.



On 8/16/07, Brian B. Riley <brianbr@mac.com> wrote:
>
> 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.
>
>
>   <http://www.wulfden.org/SpecialSale/index.shtml>
>
>
> ---
> cheers ... 73 de brian  riley,  n1bq , underhill center, vermont
>   <http://web.mac.com/brianbr/>  Tech Blog
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