3.5mm jack wiring diagram help

Thread Starter

antonis763

Joined Mar 10, 2017
12
I am making a DTMF decoder but I need to answer the phone itself. I have an old nokia phone(c1-01) witch doesn't have autoanswer mode. It has a 3.5 mm(4poles) jack as input.I don't want to take it apart, I want access to answer mode only by 3.5mm jack. I have searched for some diagrams on google but didn't work. So does anyone knows any circuit diagram that can solve my problem?
 

Dodgydave

Joined Jun 22, 2012
11,285
There are several uses for the 4 pin jack here is the main one, most headphones use the play/answer key to short out the microphone.




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