Originally Posted by
Derswede
What does your transmitter call for? Depending on what the transmitter is looking for, you have several possibilities. A cheap Electret Mike element may work just fine. I have made mikes for radios using electret Mike elements out of old cell phones, misc radios, etc. An element is a couple of bucks. First see what your radio wants/needs for input, then look for a match on the element. Several good articles are on "eham.net". Or do a google search for microphone impedance eham and thy should pop right up.