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Oscillator FM BUG Surveillance Transmitter

2016-04-08 07:29  
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Surveillance is the third album by FM, a progressive rock group from Toronto, Canada, released on Passport Records in summer 1979, the first to be "widely issued." It has been re-released for the first time in CD format on Esoteric Records in March 2013.The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is 88-108 MHz. Max current consumption is 30mA. You can power the bug with a 9Volt Battery, or you can plug a power supply to feed in 9-12 Volts. That bug will pick even a low whisper or even the sound of a breath well far from the microphone. Great spy equipment ;)
The only critical component in the FM BUG is the oscillator coil. When I say critical, I am referring to its effect on the frequency. Its critical nature only means it must not be touched when the transmitter is in operation as this will detune the circuit completely.

FM surveillance BuG Transmitter 



Datasheet file1: Click here to download 2N2222.pdf datasheet.

Datasheet file2: Click here to download BC547.pdf datasheet.