FM Transmitter Circuit

A small FM Voice Transmitter for Band 2 VHF

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.

Circuit : David Sayles

email:anc@mitedu.freeserve.co.uk

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This entry was posted on Friday, May 23rd, 2008 at 6:06 pm and is filed under Frequency, Schematics, Transmitter/Receiver. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.