In above FM Transmitter Circuit, there is a large wider channel needed.

The transmitter circuit is capable to neglect the noise signal through the amplitude variation.The circuit does have a large and complicated components.The circuit is best suited for demonstration and fm transmitter circuit project.Above circuit gives the very high efficiency in transmitting signal in a shorter range.The FM Transmitter Circuit could be made very easily as the very common components are used which are very cheap and easily available.The circuits are used to make FM transmitters used to reduce the noise in certain places.These are used in wireless components for vehicles and offices.FM Transmitter Circuits are used in a sound system as a signal transmitter.You can use copper wire up to 25-27 inches long as an antenna in the circuit, the length of the antenna however must be significant. The antenna is nothing but a piece of good conductor, in our application we’d used a copper wire of 30cm long and 26 gauges thick. The modulated signal is then transmit or radiated as a radio wave with the frequency of FM frequency range. Here, the main purpose of the variable capacitor becomes that to vary the resonant frequency in order to obtain the best FM Signal Frequency band.

The audio I.e input signal obtained from the mic is passed through the base of the transistor in order to modulate the output signal of the LC circuit in FM (I.e frequency modulation wave) Form. The transmitter circuit is capable of storing the energy for the oscillation as it is a derived from the (inductor and capacitor) LC circuits. The oscillator is required in FM Transmitter Circuit in order to generate the radio frequency carrier waves. The negative current or the negative feedback will result C2 Capacitor to the Transmitter Circuit. If the current is passed through L1 Inductor and the variable capacitor, the FM Transmitter Circuit will start oscillating with the resonant to that of the carrier frequency (I.e frequency of the carrier signal). It is a NPN transistor which is basically used for signal and voltage amplification purposes. The Transistor 2N3904 used in FM Transmitter Circuit. The Oscillation circuit could be made with the help of Transistor 2N3904, Inductor and the variable capacitor. The change in pressure of air or AC signal causes in production of such capacitance. The mic or a microphone is assumed to grab the sound signals and there is a presence of sensor with capacitance value inside the mic. The circuit diagram shown for FM transmitter circuit and the electronic components are the resistor, capacitor, trimmer or variable capacitor, inductor (coil), transmitter, mic, 9v of power supply or 7809 Voltage regulator (in case if you are using input voltage more than 9v) and an antenna. Working of simple FM Transmitter Circuit explanation The transistor is used for oscillator purpose in order to obtain Radio Frequency signal. The (Frequency Modulation) FM signal is obtained by differentiating the carrier frequency and by allowing the Audio frequency. The carrier frequency is obtained by modulating the audio signals. Carrier signal (with carrier frequency).There are two types of frequency in the signal : The Diagram shows the Block diagram for FM transmitter circuit. Block Diagram for FM transmitter circuitĬomponents required for FM transmitter circuit are modulator, oscillator, RF-Amplifier, Audio pre-amplifier, microphone and antenna. The FM Transmitter produces a range of VHF from 88 HZ to 108 MHZ. The frequency of the carrier wave would be the same as for the audio signal with an amplitude. With the help of such FM transmitters we can easily transmit the audio signals through the carrier waves with different frequencies. The FM transmitter is a circuit that uses a very low power to operate and does uses (Frequency Modulation) FM Waves to transmit the sound. Things you must know about FM Transmitter In this article, you are going to learn that how you can prepare a FM transmitter circuit and how does it work with its various applications. The performance and working of the FM transmitter circuit is dependent upon the variable capacitor and inductor. The FM transmitter completes the most excellent volume within less power. The FM transmitter achieves the application of (very high frequency) VHF radio frequencies of 87.5 HZ to 108 MHZ in both transmission as well as in reception of the Signal. In wireless communication, the (frequency modulation) FM carries the data or information by changing the frequency of the carrier wave as per the information or a message signal. The FM transmitter (Frequency modulation) circuit is made up of a single transistor or a BJT.

Single transistor fm transmitter design