Single Transistor FM Transmitter

This sensitive FM transmitter is also a fairly strong transmitter for its size. If  you are wanting to pick up low sounds, converstations, or wildlife sounds, then you may enjoy building this FM transmitter. You can build this device or you can also purchase small fm listening devices like this for not that much money.

For parts, you will need:

2 10k reisistors
1 100k resistor
1 4.7k resistor
1 330 ohm resistor
2 0.1uf capacitors
1 0.001uf capacitor
1 10-40pf capacitor
1 4.7 pf capacitor
2 2N3904 transistors
some magnetic wire and something small like a pencil for your coil

(source – http://www.uoguelph.ca/~antoon/circ/fmt3.htm)