Posted on Thursday, August 25, 2011 • Category: FM Transmitters
This miniature transmitter is easy to construct and it's transmissions can be picked up on any standard FM receiver. It has a range of up to 1/4 of a mile or more. It is great for room monitoring, baby listening, nature research, etc. L1 is 8 to 10 turns of 22 gauge hookup wire close wound around a non-conductive 1/4 inch diameter form, such as a pencil. C4 is a small, screw-adjustable, trimmer capacitor. Set your FM receiver for a clear, blank space in the lower end of the band. Then, with a non-conductive tool, adjust this capacitor for the clearest reception. A little experimenting and patience may be in order. Most of the parts' values are not critical, so you can try adjusting them to see what happens. FM Transmitter with Varactor Diode Tuning FM Transmitter Bug 2km Long Range FM Transmitter Small AM Transmitter Broadcast FM Transmitter Wireless Microphone FM Transmitter FM Music Transmitter BH1417 Stereo PLL FM Transmitter Simple FM Transmitter with BC549 8W PLL Stereo Transmitter with LCD
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