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This is a very powerful 'bug' for its size, 3V supply and number of components. This circuit includes a sensitive monaural microphone and can transmit over 80 meters within buildings and to 300 meters on an open range. Easily tunable in the FM band. This is a nice test bed for experimentation, as the circuit is simple. The input voltage can be easily increased up to 9V and the various components are easily modified. For an excellent introduction to the theory of 'simple' 2-stage transmitters download the theory notes.
Read product sheet PDF. Read McSwiggan FM Transmitter Theory PDF. Don't forget the power supply.
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