Simple FM Transmitter

[Razor]

Electron, what did you use to "weatherproof" the transmitter on the right?

[Electron]

you can use almost anything. In the pic, I used hot glue. Be careful because the glue is unforgiving, so is paraffin wax. Don't glue/wax over the microphone sound hole or the battery contacts. I would recommend simply wrapping it tightly in cling wrap and a piece of tape to hold it in place, that way your battery is protected too.