Re: Stereo and mono plug issues when connecting MIC connector and signal generator

So what u mean is that for my circuit design, I should just exclude the op amp and connect a variable resistor alone to the output of of my modulator with the other end of the variable resistor as my output signal?

That's ALMOST right.
Connect one end of the variable resistor to the output of the modulator.
Connect the other end to ground.
Connect the variable connection to the output.
(This is really just a simple volume control)

You don't need to use an OpAmp for this, )unless there is some more processing to be done to the signal after it leaves the modulator)

Thanks a lot! I was able to decrease the amplitude without the op amp and still contains my two frequecies.

HI, You have at least 2 solutions: 1) to use only one of your stereo transceiver inputs (R or L and gnd), and 2) to short circuit your generator output to both inputs. Very probably you will face no problem if transceiver input impedances are at least 10Kohm, otherwise these may sink extracurrent from generator and load it (in such case you may need a buffer (stereo). You have to care the generator's voltage to not saturate input(s). Hopefuly it will work easily. Rgds, Augusto.

Augusto

it may help to read the earlier posts and you would find there is NO stereo signal audio input to the radio

Dave