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. 1W PLL Transmitter with MC145152 1.5W VHF Amplifier 19 KHz MPX Low Pass Filter 1 Watt PLL FM Broadcast Transmitter Stereo FM Transmitter with BA1404 BA1404 HI-FI Stereo FM Transmitter - Special Edition Kit 1W Linear FM Amplifier 1.5V FM Broadcast Transmitter PLL FM Transmitter using LMX1601, ATtiny2313 AT90S2313 iPod FM Transmitter
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