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Friday, April 2, 2010

MINIATURE FM TRANSMITTER

  1. This could be the simplest FM transmitter circuit you can find on the internet.
  2. Only using a single transistor and few passive components, this transmitter can deliver signals up to 50 meters. 
  3.  The transistor Q1 serves as the modulator as well as oscillator.
  4. Capacitor C2 and inductor L1 forms the necessary tank circuit for making oscillation.
  5.  The voice to be transmitted is coupled to the base of Q1 using an electret microphone.
  6. The FM signal available at the collector of Q1 is radiated using the antenna.

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