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Re: Circuit for second PTT that will mute Mic but allow line-in...

 

Rob,

I was following the examples in the attached.


Not sure if that will work moving both of the diodes to a single resistor to Vcc, however it is just slightly different from the 2 resistors with positive voltage switching.? Again, not sure if it will work, I would breadboard and try first.

73
Evan
AC9TU
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