FM Transmitter 2N2218

Here's simple FM transmitter circuit using transistor 2N2218. Micropohone is a microphone of electret of two terminals and the antenna should possess 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
Resistors
R1 = 2,2 kΩ
R2 = 4,7kΩ
R3=5,6kΩ
R4 = 47Ω
Ceramic Capacitors
C1=4,7 nF
C2=2,2 nF
C3 = 4.7pF
C4 = 100 nF
C5 = TRIMMER CV 3-30 PF.
Transistor:
T1 = 2n2218 or equivalent.
Other:
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.

Source: Toni Electronica

See more: FM Transmitter Circuit