Le scénario
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.
Ce que contient ce dessin
Comprenez les décisions qui le sous-tendent.
01
Use a 555 timer in astable mode to generate a square wave, with R1/R2/C1 setting ~6.8 kHz.
02
Drive the MOSFET gate through a 10Ω resistor with a 10kΩ pull-down for fast turn-off and noise immunity.
03
Clamp the flyback primary with a Schottky diode to VCC to protect the MOSFET from inductive spikes.
Reuse this topology for small high-voltage AC generators, tesla coil drivers, or flyback transformer testers where a 555 timer provides a simple oscillator.