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A Nixie tube clock requires a high-voltage DC rail (typically 150–200 V) derived from a low-voltage supply. This circuit uses a 555 timer in astable mode to drive a MOSFET that switches a flyback transformer, producing the high voltage after rectification.
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Using a 555 timer in astable mode for a stable, adjustable pulse train.
02
A MOSFET (nmos) switches the flyback primary at high frequency to induce high voltage.
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Rectifying the transformer secondary with a diode and capacitor yields the filtered DC output.
When building compact isolated or non-isolated high-voltage bias supplies from low-voltage DC, such as Nixie tube, VFD, or Geiger counters.