FM RADIO TRANSMITTER BUG CIRCUIT DIAGRAM

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FM RADIOTransmitter Bug Circuit Diagram


FM RADIO TRANSMITTER BUG CIRCUIT DIAGRAM
FM Transmitter Block Diagram

Spy Bug FM Transmitters, big FM, spy microphone, FM 

Transmitter circuit

FM RADIO TRANSMITTER BUG CIRCUIT uses a Hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base-emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The coil is four turns of 18swg wire wound around a quarter inch former. 

The aerial tap is about one and a half turns from the supply end. Audio sensitivity is very good when used with an ECM type microphone insert. FM Transmitter Bug using with BC548 Transistors.

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