File Name: fm transmitter and receiver circuit diagram .zip
Here we are building a wireless FM transmitter which uses RF communication to transmit the medium or low power FM signal. The maximum range of transmission is around 2 km.
The FM transmitter is a single transistor circuit. In the telecommunication, the frequency modulation FM transfers the information by varying the frequency of the carrier wave according to the message signal. This transmitter accomplishes the most excellent range with less power.
This article will explain the working of the FM transmitter circuit with its applications. The FM transmitter is a low power transmitter and it uses FM waves for transmitting the sound, this transmitter transmits the audio signals through the carrier wave by the difference of frequency.
The following image shows the block diagram of the FM transmitter and the required components of the FM transmitter are; microphone, audio pre-amplifier, modulator, oscillator, RF- amplifier, and antenna. There are two frequencies in the FM signal, the first one is the carrier frequency and the other one is audio frequency.
The audio frequency is used to modulate the carrier frequency. The FM signal is obtained by differing the carrier frequency by allowing the AF. The FM transistor consists of the oscillator to produce the RF signal. The following circuit diagram shows the FM transmitter circuit and the required electrical and electronic components for this circuit is the power supply of 9V, resistor, capacitor, trimmer capacitor, inductor, mic, transmitter, and antenna.
Let us consider the microphone to understand the sound signals and inside the mic, there is a presence of the capacitive sensor. It produces according to the vibration to the change of air pressure and the AC signal. The formation of the oscillating tank circuit can be done through the transistor of 2N by using the inductor and variable capacitor. The transistor used in this circuit is an NPN transistor used for general purpose amplification. 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.
The negative feedback will be the capacitor C2 to the oscillating tank circuit. To generate the radio frequency carrier waves the FM transmitter circuit requires an oscillator. The tank circuit is derived from the LC circuit to store the energy for oscillations. The input audio signal from the mic penetrated to the base of the transistor, which modulates the LC tank circuit carrier frequency in FM format.
The variable capacitor is used to change the resonant frequency for fine modification to the FM frequency band. The modulated signal from the antenna is radiated as radio waves at the FM frequency band and the antenna is nothing but copper wire of 20cm long and 24 gauge. In this circuit, the length of the antenna should be significant and here you can use the inches long copper wire of the antenna.
In this article, we have discussed the FM transmitter circuit working and its applications. I hope by reading this article you have gained some basic knowledge about the working of the FM transmitter. If you have any queries about this article or to implement electronics projects for engineering students, please feel free to comment in the below section.
Here is the question for you, what is the function of the FM transmitter? Hi FM transmission is an area of communication that is always moving with technological advancements. As the new digital radios become more available, dramatic improvements will be heard by listeners.
HI, Please i am working on a 2km fm transmitter project for my degree programme, i hope to find hel here when needed on some design issues and some device literatures. Thanks sir. What is an FM Transmitter? Share This Post: Facebook. Hi Sardar Please try again and again untill you get success. Does this circuit work in real life if we build it using a breadboard. Please reply asap.
Please i really need your assistance in making a working FM Transmitter.
Copyright of this circuit belongs to smart kit electronics. In this page we will use this circuit to discuss for improvements and we will introduce some changes based on original schematic. This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. It is the ideal project for the beginner who wishes to get started in the fascinating world of FM broadcasting and wants a good basic circuit to experiment with. In figure 1 you can see a graphic representation of Frequency Modulation as it would appear on an oscilloscope screen, together with the modulating AF signal. The output frequency the transmitter is adjustable from 88 to MHz which is the FM band that is used for radio broadcasting.
The FM transmitter is a single transistor circuit. In the telecommunication, the frequency modulation FM transfers the information by varying the frequency of the carrier wave according to the message signal. This transmitter accomplishes the most excellent range with less power. This article will explain the working of the FM transmitter circuit with its applications. The FM transmitter is a low power transmitter and it uses FM waves for transmitting the sound, this transmitter transmits the audio signals through the carrier wave by the difference of frequency. The following image shows the block diagram of the FM transmitter and the required components of the FM transmitter are; microphone, audio pre-amplifier, modulator, oscillator, RF- amplifier, and antenna. There are two frequencies in the FM signal, the first one is the carrier frequency and the other one is audio frequency.
radio transmitter circuits and its schematic diagrams. Simple Two Stage FM Transmitter – This is one of the most simple FM transmitter circuit you can try out on.
A radio or FM receiver is an electronic device that receives radio waves and converts the information carried by them to a usable form. An antenna is used to catch the desired frequency waves.
Introduction In the past decade, portable wireless communication systems have experienced tremendous growth. Top 10 Articles. RF Tuner Section. Hamster Wheel Sensor T. Transmitter Circuit.
An FM transmitter circuit is a high frequency wireless device which is able to transmit voice signals into atmosphere so that it can be received by a corresponding FM receiver circuit for reproducing the voice signals in a loudspeaker. All the FM transmitter circuits presented below are significantly powerful, hard to trace in their hidden positions, and equipped for grasping even the weakest of whispers in the vicinity. Moreover the designs are capable of transmitting the picked information upto radial distances exceeding 2 kms. The above extraordinary capabilities have forced the legal authorities to enforce stringent laws against the use of these transmitters without permission, so before you make and use one of these make sure you have all the legal formalities completed. Interested to learn how to detect these hidden Spy transmitters?
In this project, we learn how to create a high range FM transmitter, which has the range of 2 kilo meter 2KM radius. This is basically a simple DIY hobby circuit and you can try it in your home with minimal components. Start building this high range FM transmitter and see how your output comes.
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