This article should satisfy those who might want to build a low power FM transmitter. ... Because the trimmer cap is very sensitive, make the final frequency adjustment on the receiver.

Web site Mac OS X hints has an interesting tip for improving the performance of FM transmitter car kits (you know - for those of us with no tape deck and no auxiliary inputs for our MP3 players):

Simple FM transmitter with a single transisto ... Once it's OK, you may use trimmer capacitor to make further frequency adjustments. You may get help of a experienced person on this point.

This is a single transistor FM transmitter that is about the size of a standard AA battery. The site has all the schematics and technical specifications needed ... Make: Holiday Gift Guide 2009:

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Here is the schematic, PC board pattern, and parts placement for a low powered FM transmitter. The range of the transmitter when running at 9V is about 300 feet.

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