Bob Camp wrote:
Hi
Audio codecs (especially monophonic ones) are pretty cheap these days.
Depending on volume they can get to the sub $1 range. Even in small quantity
they are below $4. That makes them a pretty tempting "front end" for a send
/ receive box.
Bob
i would think, given that the audio carrier is 1kHz-ish, that almost any
of the small microcontrollers would work, using a single bit in/out with
some RC signal conditioning. Maybe a bit of a challenge for the
receive.. you'd need two inputs with different resistors.
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