If you ever wanted to build a very small FM transmitter, then this is the circuit for you. With only 16 components, this is a very compact FM transmitter. I like small circuits because they give you a chance to build something quickly. Sometimes if you pick a project too large, then you can’t get it done.
If you would like to pick up the parts before building, here is a list of the parts for this small FM transmitter.
Two 100K resistors
1 10k resistor
1 470 ohm resistor
2 470pF capacitors
2 4.7µF, 16V, electrolytic capacitors
2 4.7pF capacitors
1 4-40pF trimmer cap (this is optional, but if you are putting in an order to Digikey for electronic parts, just go ahead and get this as well.)
2 2N2222, NPN transistors
1 Electret Microphone
1 9 Volt, Alkaline battery, or you can use a 9 volt power source.
I like to create these projects on a breadboard first. If you can, purchase a good breadboard kit. Here are the full instructions to build it: