We found this circuit in a 1982 documentation, but the circuit can still be easily assembled, as the components are common. Only the driver transformer should be used with an old radio. The L1 coil has 4 turns of wire 22 to 26 in the form of 1 cm without core. XRF is a shock of 100 uH. The output transformer also can be found in an old transistor radio.
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