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400mW VCO FM Transmitter

400mW VCO FM Transmitter

This simple 400mW transmitter broadcasts audio on 87.5 – 108 MHz FM radio band. With good dipole antenna transmission range up to 4km is possible. Frequency is selected by adjusting R1 potentiometer. Transmitter should be powered by regulated 12-14V power supply with at least 100mA current rating.

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