![]() However this prompts the emitter capacitor to discharge, allowing the collector current to yet again resume its flow, initiating a fresh cycle of oscillation. This called for an increase in the feedback capacitor and also to use a transistor specifically designed for handling extreme high frequency ranges such as a BF494.įurther modifications include an inductor with the emitter of the transistor, and a capacitor across the emitter resistor of the transistor.ĭue to this the transistor is switched ON as soon as the base emitter voltage of the transistor falls significantly, resulting in an abrupt cut off in the oscillations. Here we have tried to enhance the design such that the amplitude becomes considerably magnified in order to turn OFF the transistor completely during the oscillations. How the One Transistor FM Radio Receiver WorksĪs mentioned above, the circuit is basically a single transistor superregenerative RF oscillator with a constant amplitude. ![]() However fewer components also means a few compromises involved, here the receiver requires a large metal base for grounding the unwanted signals, and for keeping the noise factor to the lowest, and also this system would work only in places where the reception is rather strong and thus may not be suitable in areas where the signal strength is thinner. ![]() It's basically based on a superregenerative audion receiver circuit where the use of minimal components becomes the main feature of the unit. ![]()
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