Fm Bug. Nov 29, 2014 · how to build a fm spy bug circuit diagram.

Nov 29, 2014 · how to build a fm spy bug circuit diagram. For a frequency of 90MHz, theantenna should be 165cm long. With as few as 20 components, a circuit can be designed to transmit an impressive distance and produce an audio quality that sounds almost indistinguishable from reality. To create a good design, like this, each transistor should be required to perform only one task. SETTING UP THE TRANSMITTER When the FM BUG is complete, checked and ready for insertion into its case, there is one slight adjustment which must be made to align it to the correct frequency. The terminal marked A on the board is the antenna output. This is classified as a half-wave antenna and provides one of themost effective radiators. As we have said, the only critical component is the oscillator coil. It’s quite similar to the one we looked at yesterday, but this uses 100% salvaged parts.  The FM Listening Bug Kit gives you all you need to build a small, single Transistor, FM transmitter that can operate between 80 MHz and 150 MHz.

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