Hi,
a quick update about small transceiver module.
I was looking at Baofeng microphone that I normally use for my Baofeng FM radio and I thought to use complete microphone as a part of small transceiver.
The idea is that Baofeng microphone includes all what's needed: it's got electret microphone, speaker & a TX switch. If I add a small LiPo and small transceiver module I'd get a small transceiver - in a shape of microphone.
I had ony to make one simple modification to the microphone. Had to add a simple circuit to ensure TX switching. Namely Baofeng mic. makes TX when PTT switch connects to GND, while at transceiver module we have to connect PTT to +Vcc. Mod is simple - see the image below: