Inverter as high voltage low current source

The circuit is capable of providing power for portable Geiger counters, dosimeter chargers, high resistance meters, etc. The 555 timer IC is used in its multivibrator mode, the frequency adjusted to optimize the transformer characteristics. When the output of the IC is high, current flows through the limiting resistor, the primary coil to charge C3. When the output is low, the current is reversed
Inverter as high voltage low current source - schematic

With a suitable choice of frequency and C3, a good symmetric output is sustained.

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