Maker Pro
Maker Pro

FM or AM transmitter?



Jan 1, 1970
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 for an am transmitter, but
again it's for line level input, and adding an amp would make it larger

Thanks for any suggestions, all are appreciated.