Headset -> Camcorder audio adapter

Don't worry about matching impedances. The headset output impedance is
so low compared to the input impedance of the camera that there will be
no need to match them.

I did this with a JVC VHS Camcorder about 12 years ago & got a good
signal level match with just a direct connection. Just open the
intercom squelch if you want to get aircraft background noise too. You
may have to fool with the signal levels some, but as I remember it
worked out surprisingly well right out of my soldering iron.

I saved the tape as being a flight breakfast example for any future
grandkids.