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Mini FM transmitter with transistors

In this schematic is presented a simple mini FM transmitter circuit with transistors.
Transistors used in this mini FM transmitter circuit are 2N2222 type transistors.
The power supply for this mini FM transmitter circuit with transistors can be a stabilized 9V power supply or you can use a 9 volts battery.

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.
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 circuit is nothing else than a piece of wire from 6" to 12"

mini FM transmitter circuit based on 2N2222 transistor

Parts list

Notation Value/Description
R4,R2
R1,R3
R5
C2,C6
C5,C3
C1,C4
Cx
L1
Q1,Q2
100K
10K
470 ohm
470pF
4.7µF, 16V, electrolitic
4.7pF
4-40pF trimmer cap (optional)
1µH
2N2222

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