Radio circuit diagrams electronics projects

In this schematic is presented a simple mini FM transmitter with transistors ( emitter ) which use two 2N2222 transistors. To get a bit of tuning out of the coil you could put a 4-40pF trimmer capacitor parallel over the 1 µH inductor. Unpolarized capacitors are ceramic capacitors and pols capacitors are electrolytic or can be tantalum types. The power supply for this mini FM transmitter with transistors ( transmitter ) can be a stabilized 9V power supply or we can use a 9 volts battery.

Transistors can be substitute with something similar you already have , but it maybe necessary to adjust the collector voltage of Q1 by changing the value of R1 or R2 . It should be about 1/2 the supply voltage (about 4 or 5v).
The antenna required by this mini FM transmitter is nothing else than a piece of wire from 6" to 12"

Parts list