simple FM transmitter

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.

simple and powerful f.m. transmitter

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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Comments

  1. I want to your full project to understand how to do it. could you send to my email?

  2. abhishek bhati says:

    sir pls tell me
    at what freequency reciver receives the sound….
    pls sir help me……..

  3. @ Abhishek
    at resonant frequency, the receiver receives the signal(sound).

    formula is fr(resonant frequency)=1/{2(pi)√ LC}

  4. kevin sequeira says:

    I wanted to use this circuit alomg with a reciever in order to make my electric guitar wireless. I wanted to know what must be the range of input I must apply to the fm transmitter?

  5. Hi! I want to create a PCM audio transmitter in the 3.5-3.75 MHz range… What values/changes should I do to the circuit in order to get this working? (BTW I also want to build the receiver for this system) THX!

  6. what is use of L1?

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