Anyone have any experience with building an adaptor that will let you
plug a Rat Shack PTT mic into a standard cell phone headset jack?
Sometimes I need to use my phone when background chatter is a problem,
and a PTT would help keep the party on the line from hearing and being
distracted by all the noise. Ideally, the sound could come out of the
mic (as it does when plugged into an FRS radio) and be simplex
operation.

My cell provider offers PTT service, but that only works when the
other user is on a PTT handset (and requires a higher monthly rate
plan). That's not what I need.

TIA!