Simple Ignition Coil Driver

Introduction

This circuit is the easiest way to produce high voltage at high current ( a 2-3 cm long red-violet hot arc ) from a 24V power supply. This device may be used to ignite flammable materials (gases or liquids) or supply home-built laser tubes such N2 UV laser.

Theory

There's not much to say about this circuit; the triggered nand gate produce a square wave with the frequency controlled by R3 and Duty-Cycle controlled by R4. This oscillator circuit drive the power mosfet connected to the primary winding of the ignition coil.

Safety Hints

This circuit is supplied with low voltage and it's so simple that the unique obvious suggestions is don't touch the output terminal.