This is a VCO FM Transmitter. With good antenna (dipole placed outdoor and high) the transmitter has very good coverage range about 500 meters, the maximal coverage range is up to 4 km. To calibrate for maximum power connect 6 V / 0,1 light bulb to the output and use R1 to tune th...
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(5) Remove Cb89 and Cb90 (1500 pF).(6) If the output wiring has been modified to go direct from the + terminal points of the removed C49 and C50 to the output jacks, then change R62 & R63 from 33K to 18K to reduce the op-amp's gain....
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This simple circuit is based on BA1404 FM Transmitter, works with two AA batteries and can drive a 300W dipole antenna for improved range. There are many applications for an FM transmitter, particularly if it can broadcast in stereo. You can broadcast stereo signals from your CD player or an...