We found this circuit in a French publication from the 1980s. The coils L1 and L2 are formed by 4 coils of wire 26 in the form of 1 cm in diameter with a central socket. T2 can be a 2N2222 and T3 a 2N2218 or another of greater power. The circuit must be powered by a source, given its consumption, or even by large batteries.
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