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Circuits > RF circuit > FM Transmitter Bug
FM Transmitter Bug
Application Notes:
This small transmitter 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. David's
email : radio_david@yahoo.com
Title: FM Transmitter Bug
Source: www.electronics-lab.com
Published on: 2005-02-03
Reads: 1266
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