![]() That couples the generated FM signal to the antenna. The capacitance of the trimmer capacitor can be changed to get different frequency in the FM radio frequency range. This oscillator is designed to oscillate in the FM frequency range 86MHz to 106MHz. If you want fixed transmission carrier then calculate FM tank oscillation (L1, C2) and choose the elements. ![]() Here Transistor BC547 configured in common emitter and input signal is taken from condenser mic. The inductor L1 together with C6 and C3 forms an oscillator in colpitts oscillator configuration. This Single Transistor Voice FM Transmitter circuit can produce FM Carrier signal from 50MHz to 160MHz by using the C1 and C2 tank circuit. The capacitor C6 is a variable trimmer capacitor of 10pF to 40pF. L1 is air core inductor made up of 5 turns of laminated copper wire with 5mm inner diameter. The emitter bias resistor R3 is also ac bypassed using the bypass capacitor C4. Similarly we bias the emitter of the transistor using the resistor R3 so that there is negative feedback and the output is stable to compensate the changing beta of the transistor due to environment temperature. The transistor is biased using emitter biasing technique which was explained in the tutorial How to design emitter biased BJT amplifier.The resistor R2 is for biasing the base of the transistor, that is to turn on the transistor so that it operates in the active region of operation. at 1.5 Volts Main advantage of this circuit is that power supply is a 1.5Volts cell (any size) which makes it possible to fix PCB and the battery into very tight places. The audio from the microphone transducer into the base of the transistor via the coupling capacitor C1. Simple FM Transmitter involves on a single transistor oscillator Technical datas: Supply voltage : Power consumption : Range : 1.1 - 3 Volts 1.8 mA at 1.5 Volts 30 meters max. Project Name: FM Transmitter Project Using Single Transistor. The resistor R1 provides the voltage required for the electret microphone to operate. Read FM Transmitter Project Using Single Transistor by GURUJI available from Rakuten Kobo. In the above circuit diagram, the audio is enters the FM transmitter via the electret condenser labelled MIC1. The corresponding schematic diagram is shown below. The following shows the FM transistor build with one transistor. ![]() Other than this single transistor we need just few passive components and battery. How does the transistor act as a varicap to perform FM. It consists of a simple oscillator with silicon planar RF PNP transistor. The transistor used is 2N3904 general purpose transistor. How on earth could a single transistor form the heart of a radio receiver with enough sensitivity and selectivity to be useful. This simple transmitter allows you to broadcast on FM radio band (VHF) 87.5 - 108 MHz. However, it will be difficult to obtain the oscillation at 100 MHz. Here it is shown how to build a simple single transistor FM Transmitter. FM transmitter FM carrier frequency can be calculated by the LC tank (L1 and 33pF) 1 1 21VLC 27L1 33pF We would like to design an FM transmitter that radiates around 100 MHz. ![]()
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