Dtmf Help

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smokinglighten

New Member
Hi since this is my first post I guess I'll give you a bit of a background my name is Tyler and I'm a freshman. And why I have modified a old rc buggy in to a robot platform and i would like to try to communicate to with it from long distances with FSK. Anyway to get to the point I have not been able to find a dtmf encoder ic i can buy. Such as from B.G. Micro or Jamico Eletronics. If anyone know where i could buy 2 it would be very helpful thanks :):)

Thanks,
Tyler
 
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inglewoodpete

Senior Member
The MC145436 chip (14 pin DIL) should be widely available. Hobby outlets like Radioshack should still carry it in the US.
 
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profmason

Member
The MC145436 works great, but has gotten pretty had to find since Motorolla stopped production a few years ago. Another reasonable and DIRT CHEAP choice is the Holtek HT9170B. (About $0.50 each)
Data sheet is here:
http://www.holtek.com.tw/pdf/comm/9170v110.pdf
I have ordered them from futurelec in the past. They are slow (Coming from far east) but great selection and prices:
http://www.futurlec.com/ICSFOthers.shtml

Here is a picaxe based RC conversion project I did:
http://profmason.com/?p=471
and another page on RC protocols
http://profmason.com/?p=508

keep us informed on how it goes!

EDIT: Brendan posted while I was posting. As an addendum you will need an oscillator to run any of these chips. You could of course implement DTMF output using a pair of picaxe08Ms(Each using the tone command.) Feed this into a RC circuit to smooth it out and it should work.)
 
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