Overview: What You'll Build
A basic DIY induction heater — sometimes called a "Royer oscillator" or ZVS (Zero Voltage Switching) induction heater — can heat small steel objects to glowing temperatures using a modest power supply. These circuits are popular in the maker community for their simplicity and educational value. This guide walks you through a safe, beginner-friendly 12–24V DC version.
⚠ Safety First: Even low-voltage induction heaters generate strong electromagnetic fields and very high temperatures at the coil. Always use insulated tools, keep pacemaker users away from operating equipment, and never leave the circuit unattended while powered.
Components You'll Need
- 2× MOSFET transistors (IRFP250N or IRFP260N recommended)
- 2× fast recovery diodes (UF4007 or similar)
- 2× 10kΩ resistors (1/4W)
- 2× 470Ω resistors (1/4W)
- 4× 0.33μF / 630V polyester capacitors (for resonant tank)
- Copper tubing or 14–16 AWG enameled magnet wire (for the work coil)
- Ferrite toroid core (for gate drive transformer)
- 12–24V DC power supply capable of 5–15A
- Heatsinks for the MOSFETs