On Tue, 28 Oct 2003 16:00:49 -0400, carlosmarcano wrote:

>
> I4ve been googling around to find some info about dtmf decoding using pic
>micros and I have found some nice circuits. The thing is that most of them
>use impedance transformers from the line to the pic in their hardware
>interface. The problem is that here in my country is really hard to find
>those. Is there any "easier" or maybe "dirtier" way to make the coupling
>between the phone line and the pic, so the microcontroller can make the
>dtmf decoding? Any suggestion is welcome....
>

Could you perhaps cannibalize a discarded telephone, modem, or
answering machine?


Regards, Bob

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