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Friday, June 14, 2013

FM Transmitter using a single transistor!

Intro: (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. This contrasts with amplitude modulation, in which the amplitude of the carrier wave varies, while the frequency remains constant. wikipedia



Many thanks to Richard McWhorter (AllAmericanFiveRadio) for the idea and circuit diagram.


In my setup I biased the transistor in a different way. I used 3.5 volts to power the circuit. 
Here is my modified circuit. It works with 1.5 volts and has an excellent range without an antena.
Please note that the 1uF capacitor and the positive terminal of the 1.5V both are connected to the center of the coil.