I am planning to build a headphone splitter/switch so I can listen to one K3 in the left ear and the other radio in the right ear or turn off the audio from either radio.

Two questions:

Is there a commercial item for this purpose?

I know I will need an audio isolation transformer between each radio and the splitter/switch.   Any suggestions on what a good impedance value would be for those transformers?

Thanks

Rich

K3RWN

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