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Audio Signal to PIC

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incromatical

New Member
Hi, kinda new to designing circuits so help me out if you can please.

I want to take an audio signal, check if signal is being transmitted and drive a PIC logic High if it is.
Nothing fancy, I want to send a code this way.

Thanks in advance

: )
 
Define 'signal' do you want to detect a simple tone?
 
You mean pulse of tones like DTMF tones?
 
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