Wiring diagram for mic?

Orval Fairbairn wrote:
IIRC, the audio is the tip of the jack; the key is the next position on
the jack. Ground is the outer (long) part of the jack. Check with a
circuit tester.

Good post, Orval, but I need to chime in. Mic Key/PTT is the tip. By
"grounding" the tip, the radio opens the transmit circuit.

The next ring is audio, and the long shaft is ground.

When I modified an existing headset to have a PTT on the right earcup, I
had to connect a wire from the .206" plug tip to the switch, which then
connected to a ground source inside the headset.

Dave