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FM Radio

An FM transmitter circuit uses a transistor to generate a frequency modulated signal. It works by using a microphone to capture audio signals, which are then modulated by a transistor oscillator circuit containing an inductor and variable capacitor. This creates an oscillating tank circuit that transmits the audio signal by varying the carrier frequency. The circuit diagram and block diagram are provided, along with a list of components including the 2N3904 transistor, capacitors, resistors, microphone, and battery. Advantages of FM include less interference and noise compared to AM, while disadvantages are higher equipment costs and a more complex receiver/transmitter design.

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103 views3 pages

FM Radio

An FM transmitter circuit uses a transistor to generate a frequency modulated signal. It works by using a microphone to capture audio signals, which are then modulated by a transistor oscillator circuit containing an inductor and variable capacitor. This creates an oscillating tank circuit that transmits the audio signal by varying the carrier frequency. The circuit diagram and block diagram are provided, along with a list of components including the 2N3904 transistor, capacitors, resistors, microphone, and battery. Advantages of FM include less interference and noise compared to AM, while disadvantages are higher equipment costs and a more complex receiver/transmitter design.

Uploaded by

Mounika
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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FM-RADIO TRANSMITTER

ABSTRACT:

An FM transmitter is a circuit that developed frequency modulated signal using a


transistor. This circuit is basically a radio system which aids with antenna and
increases the electromagnetic signal. In FM transmission they based on the frequency
range of 88MHz to 108MHz. when the input audio signal is applied to the transistor
and the output signal is module and set the resonant frequency we change the
capacitance value. After setting the resonant value we connect to the oscillator.

WORKING:

The main working of FM transmitter is to consider the microphone is to understand


the signal which inside the mic and there is a presence of capacitive sensor. Its
produce when the vibration is produce for air pressure and AC signal . The formation
of the oscillating tank circuit is done by the transistor of 2N3904 by using inductor
and variable capacitor. The transmitter which is used in the circuit is an NPN transistor
and generally used for amplification purpose . If the current is passed at the inductor
L1 and variable capacitor then the tank circuit will oscillate at the resonant carrier
frequency of the FM-modulation.

CIRCUIT DIAGRAM:
BLOCK DIAGRAM:

COMPONENTS:

 2N3904 transistor
 10pF capacitors x 2
 10nF capacitor x 1
 1nF capacitor
 470 ohm resistor
 Condenser mic
 10k ohm resistor
 Copper wire for inductor
 9v battery

Advantages & Disadvantages:

 Less interference and noise.


 Power consumption is less as compared to AM.
 Adjacent FM channels are separated by guard bands.
 Equipment cost is higher. Has a large bandwidth.
 More complicated receiver and transmitter.
 The antennas for FM systems should be kept close for better
communication.
PROJECT GUIDE: MR SURIBABU SIR

GROUP MEMBERS:

B .LAXMI PRIYA

E. PAVAN
K MANJUSHA

K . MOUNICA

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