This circuit was found on a 1974s Radio Elettronica (Italy). The circuit can still be assembled today with the 2N2222 transistor. Only the original integrated circuit is more difficult to obtain. The range is of the order of a few tens of meters and the bonnet consists of 4 turns of 26 or 28 wire with a diameter of 1 cm without core. The antenna must be 10 to 40 cm if used and must be connected to the Q1 collector.
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