Simple FM Radio Transmitter Project
Here, is a very interesting and simple project in the series of communication used to transmit noise free F.M. signal in the wide range up to 100 M using only one transistor. The transmitted message from F.M. transmitter circuit is received by the receiver having the facilities of F.M. channel or you can also try F.M. receiver circuit published in this website.
Circuit Description of simple F.M. transmitter
The entire circuit of F.M. transmitter is divided into three major stage i.e. oscillator, modulator and amplifier. The transmitting frequency of 88-108 MHz is generated by adjusting VC1. The input voice given to microphone is changed into electric signal and is given to base of transistor T1. Transistor T1 is used as oscillator which oscillates the frequency of 88-108 MHz. The oscillated frequency is depended upon the value R2, C2, L2 and L3. This transmitted signal from F.M. transmitter is received and tuned by F.M. receiver.
Resistors (all ¼-watt, ± 5% Carbon)
R1 = 180 KΩ
R2 = 10 KΩ
R3 = 15 KΩ
R4 = 4.7 KΩ
C1 = 10 KPF
C2 = 10 PF
C3 = 20 KPF
C4 = 0.001 µF
C5 = 1 µF/10V
C6 = 4.7 PF
C7 = 10 KPF
C8 = 3.3 PF
VC1 = 22 PF
T1 = BF194B
MIC1 = Condenser mike
L1, L2 = 3 turns of 22 SWG wire around any thin pencil
L3 = 2 turns of 22 SWG wire around any thin pencil.
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