FM radio transmitter on a dual-gate MOSFET transistor BF966. Operating range 150 meters. Sound modulation is performed at the point of connection to the antenna, the sound source must not be sensitive to high-frequency voltage.The coil contains 6 turns of wire with a diameter of 0.4 mm and is wound on a mandrel with a diameter of 6 mm, the tap is approximately from the middle, this must be selected.
Connect the RF probe between the antenna and the transmitter. The LED should shine brightly. Turn the power off and on, do this several times. If the transmitter starts and works stably, then everything is fine.
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