Having the transistor saturate in an oscillator circuit like that tends to kill the Q of the resonator, which significantly reduces the radio performance, but things ought to still work. Im very happy with the results It is the Sinclair Micro FM.
modification to the FM frequency the modulated signal from the antenna is radiated as radio wave at the FM frequency band. I have built an FM radio receiver from a kit. The variable capacitor is used to change the frequency of the circuit. The one transistor AM radio receiver is something all whippersnappers try out when starting out on the royal road to radio building. The circuit powers from two 3.6-volt lithium cells or a small 4.5-volt battery for better efficiency. The inputs the audio signal from the mic passes to the base of the transistor with modulation. The tank circuit (oscillator circuit ) is derived from the LC circuit ( inductor and capacitor ) to store the energy for oscillation. To generate the radio frequency signals, The FM transmitter circuit requires an oscillator circuit. Simulation and prototype construction revealed that the updated circuit with 2N3904 transistors worked slightly better than the expected. The Superheterodyne receiver is sensitive to weak signals and easily distinguishes between stations that are close together. The negative feedback will be e the capacitor connect in the transistors emitter and the collector to the oscillating tank Circuit. This is the type of receiver upon which all modern AM/FM radios are based. The current passed Through the inductor and variable capacitor then the tank circuit will oscillate at the resonant carrier frequency of the FM modulation. The circuit diagram shows the FM transmitter circuit and the required electrical and electronic components for this circuit. This transmitter transmits the audio signals through the carrier wave by the difference of frequency, that carrier wave frequency is equivalent to the audio signal of the amplitude, and the FM transmitter produces the VHF band at the frequency of 88 to 108.0 MHz. This FM transmitter is a low power transmitter (100-meter range) and it uses FM wave from transmitting the sound. Infineon Technologies provides high-performance radio frequency (RF) transistors targeting FM radio applications. the performance and working of the audio transmitter circuit depend on the induction coil and variable capacitor this article will explain the working of the FM transmitter circuit and with its application. This transmitter complies the most excellent range with less power (3v).
Packaging the Radio The recommended RadioShack project box includes metal and plastic tops. With the capacitor in the circuit, the receiver will then tune the 80-meter band. The frequency modulation (FM) transfers, the information through the frequency of the carrier wave according to the message signal. Q1 2N2222A NPN transistor (RSU11328507) or MPS2222A (RS 276-2009) R1, R3 1 k (RS 271-1321). The FM transmitter is a 3 transistor circuit.
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