Here's simple FM transmitter circuit using medium power 2N2218 transistor. Micropohone is of electret type that connects to two input terminals and the antenna should be a copper wire from 15 to 40 cm. Below is schematic circuit of the fm transmitter.
Printed Circuit Board (PCB) and Component Layout of the fm tranmitter.
Parts List of the fm transmitter
R1 = 2,2 kΩ
R2 = 4,7kΩ
R4 = 47Ω
C3 = 4.7pF
C4 = 100 nF
C5 = TRIMMER CV 3-30 PF.
T1 = 2n2218 or equivalent.
L1 = 5 turns of enameled thread 22 AWG, diameter of 10 mm.
B1 = Battery of 9 volts alkaline.
Mic1 = electret microphone.
Several = printed circuit board, antenna, box, etc.