R1 may be 10k and R2 100k. The transistor can be the BC548 and instead of the small lamp we can use a series LED with a 1k resistor. D1 is germanium and C1 is 10 nF. C2 can be 47 nF.
It actually consists of a tunable field strength meter. The circuit is of an old documentation and the...
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The bipolar transistors may be BD136 and BD136 and FET of any type for 1 A current at least. The...