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ELECTRONICS

555 Timer Flyback Driver for Plasma Globe High-Voltage Supply

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UPDATED 2026-09-23
TYPECircuit
USE-CASE555 Flyback Hv Driver
EXAMPLE555 Timer Flyback Driver for Plasma Globe High-Voltage Supply
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CASE ANALYSIS

Scenario

A hobbyist builds a high-voltage supply for a plasma globe using a 555 timer astable oscillator, an IRFZ44N MOSFET, and a flyback transformer. The circuit converts 12V DC to high-frequency AC, with a clamping diode protecting the MOSFET.

Key decisions

  • Use a 555 timer in astable mode to generate a square wave, with R1/R2/C1 setting ~6.8 kHz.
  • Drive the MOSFET gate through a 10Ω resistor with a 10kΩ pull-down for fast turn-off and noise immunity.
  • Clamp the flyback primary with a Schottky diode to VCC to protect the MOSFET from inductive spikes.

When to reuse this

Reuse this topology for small high-voltage AC generators, tesla coil drivers, or flyback transformer testers where a 555 timer provides a simple oscillator.

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