I am looking for a sort of wireless mi rophone that's really small to use on stage(we want the actor to wear it). I looked at commercial ones, but they're way too expensive. I was hoping to make a simple one myself(it doesn't have to be great sound quality) and, after looking at some kits I came to the conclusion that the simple fm transmitters were unsuitable because their broadcast frequency probably shifts too much and too easily since none of them are crystal controlled. Could I use a VXCO somehow to transmit FM? (maybe with a frequency doubler or something) Does anyone have any good designs for stable FM transmitters? (I found out there's 2 nice single chip transmitters, the BH1417 and BH1416 by rohm but the design in the datasheet is for line input only. I guess I just add an amp and a mic? are there any components I could leave out from the datasheet design to simplify it?) also, the single chip designs have AGC, so that would be a plus. Could I just use a 1 MHz oscillator (like a can type) and some discretes(including a mic) for a transmitter? I found a good looking design at http://www.techlib.com/electronics/amxmit.htm for an am transmitter, but again it's for line level input, and adding an amp would make it larger still. Thanks for any suggestions, all are appreciated.