
Check the power stage layout before assembling any high frequency heating device. A typical mains powered metal heating unit works from a 200–240 volt AC supply, rectified into high-voltage DC around 310–325 volts. This energy feeds a switching stage built with MOSFET or IGBT transistors that drive a copper work coil. The switching frequency usually falls between 20 kHz and 100 kHz, producing a strong alternating magnetic field around the coil.








