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FM WIRELESS TRANSMITTER
NICKSON KIPKEMOI
DTEE/503J/2020
Abstract Results Block Diagram Conclusion
The FM transmitter operates on the principle of frequency modulation, .
An FM transmitter project typically involves building a device that can transmit where the frequency of a carrier wave is varied in accordance with the
audio signals wirelessly through the air via FM radio waves. This can be a fun and amplitude of an audio signal. This modulation process allows the We can conclude that, FM is widely used because of several advantages of
transmission of audio signals through radio waves. The key components frequency modulation. Earlier FM was not commonly used because of lack of
educational project for electronics enthusiasts, amateur radio operators, or anyone of an FM transmitter include an audio signal source, modulation understand of how to benefit from FM and thus radio communications was
interested in learning about wireless communication. The basic principle behind an circuitry, a stable frequency oscillator, a voltage-controlled oscillator, an used. As soon as the benefits of FM come into existence, its use grew up. There
amplitude limiter, an RF amplifier, and an antenna. are many advantages and also disadvantages of FM. Inspire of having
FM transmitter is to modulate the frequency of a radio wave to carry an audio
By modulating the carrier wave with the audio signal, the transmitter disadvantages, it is suitable for many applications and also other modes may be
signal. The input audio signal is used to vary the frequency of a carrier wave, such more suited to other applications. In order to enable the choice of the best
generates radio waves that can be received by compatible receivers
that the frequency of the wave changes in proportion to the amplitude of the audio within its transmission range modulation format to be made, it is required to understand the disadvantages
and advantages of FM.
signal. This modulated radio wave can then be transmitted wirelessly through the
air and received by any FM radio within range. Overall, building an FM transmitter
can be a challenging and rewarding project that can help you learn about electronics
and wireless communication Circuit Diagram
Objectives References

Overall Objective
1. To design and construct an FM transmitter with a range to be at least 30meters * [1]Transmitter Revolution. [Online]. Available: https://en.wikipedia.org
2. To design and construct a circuit that will allow wireless audio transmission from any audio (accessed Aug 14, 2022)
device to an FM radio.
3. To Ensure that the transmitter is powered by a battery or a power outlet depending on the user's Project Time management * [2]How To Build An FM transmitter Circuit Its Working and Applications.
preference [Online]. Available: https://www.elprocus.com (accessed Aug 14, 2022)
4. To design and construct a user-friendly interface that will allow the users to adjust the * [3]A.P Godse and U.A. Bakshi, Analog Communications. Technical
frequency range of 104.5 Publications Pune, 2009.
5. To design and construct a circuit ensuring the transmitter operates within a power transmission
of 1 watt Results * [4]V.K Mehta, Rohit Mehta, Principles of Electronics. S. CHAND &
Specific Objectives COMPANY, 2008.
To design and construct an FM transmitter . * [5]Miniaturised FM transmitter.” [Online]. Available:
http://pe2bz.philpem.me.uk/Comm/-
Methodology
The FM transmitter will be based on direct frequency modulation technique using a
* %20Transmitters/-%20FMx/FMx-902-PortableMiniSterio/Index.
BC457 NPN transistor and some capacitors and resistors . The Transistor does the [Accessed: 18-Aug-2022].
main work of creating modulated frequency of electric signal which is gained from * [6]Single Transistor FM Transmitter Design | electronics hobby.”
electric mic as an analog signal . With the help of DC voltage source of high amount ,
[Online]. Available:
it creates a signal of high frequency . In accordance of help , there are used of several
https://dmohankumar.wordpress.com/2011/04/23/single-transistor-fm-
pf and uf capacitors and resistors . The capacitors help to store the voltage for a
several amount of time and resistors create hindrance according to necessary of the transmitter-design/. [Accessed: 18-Aug-2022].
project . Here 6 to 12 voltage of power source can be used for power of high * [7]Paul McLane, “Radio World: FM Signal Count Grew 38% in Ten
frequency which will work as a carry frequency . The hope is to have a perfect FM
Years.” [Online]. Available: http://www.radioworld.com/article/fm-
transmitter of a range of 10m with a clear sound transmission . Here sound frequency
signal-count-grew--in-ten-years/277873. [Accessed: 18-Aug-2022].
should be in the range of 89 to 90 Hz . Our expected frequency is 89.7. An antenna
will be used for higher output on emitter or collector in any side . And a coil is
necessary for the project which would be connected with the emitter side of the NPN
transistor .
Figure 1: components soldered in strip
board .