Tuesday, 28 October 2014

simple FM transmitter

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.



PARTS LIST

Resistors (all ¼-watt, ± 5% Carbon)

R1 = 180 KΩ

R2 = 10 KΩ

R3 = 15 KΩ

R4 = 4.7 KΩ
Capacitors

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
Semiconductor

T1 = BF194B
Miscellaneous

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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