This excellent wireless microphone circuit for the varicap-modulated FM band came out in Electronics Now & Radio Electronics magazine from February 1993 and can be easily assembled with a 2N2222 or BF245 transistor instead of the original. The microphone can be piezoelectric, and the coil is formed by 4 turns of wire 22 to 26 in the form of 1 cm without core. The antenna is 10 to 30 cm long. Varicaps of the BB series can be used in place of the original.
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