This circuit can be used to transmit signals modulated in tone on remote controls or even pulses in a data link system. The range can reach 100 meters with a 30 cm telescopic antenna. The coil is made with thread 22 in the form of 1 cm in diameter without a core. CV is a trimmer of approximately 2-20 pF and all capacitors must be ceramic. The circuit is from a book by Newton C. Braga.
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