Re: No sidetone on QCX #qcx #sidetone

howard winwood G4GPF

I changed Q6 as I thought that might be the problem.  And while I was at it, I updated the firmware to 1.07a. There is sidetone coming from the micro on R59  according to the scope.

if you see the sidetone at R59, you then need to trace it through IC8b (pin 7), IC8a (pin 1),IC9b (pin7), IC9a (pin 1) via volume pot and Q7 to IC10b (pin7), IC10a (pin 1) to headphones.
The pins quoted are the output pins on each op amp

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