For the circuit to work continuously, a cooling fan must be added to blow down from above to cool the resonant capacitor, magnetic ring and other components. In particular, the capacitor generates a lot of heat when it works for a long time.When using switching power supply, please pay attention, because high-power power supplies generally have a slow-start function, that is, the output voltage rises slowly after the power is turned on, and if the induction heating circuit is turned on before the voltage rises to 10V, it will be If it is not enough, it will not vibrate, causing the two mos tubes to be turned on at the same time and burn the components.So to add a switch between the power supply and the heating circuit, turn the switch first. After the power is turned on for three to five seconds, the voltage is stable, and then the switch is turned on to energize the induction heating circuit.When heating objects such as iron rods or iron pipes, if you use a 40mm diameter heating ring, the diameter of the iron rod should not exceed 10mm, otherwise the circuit may be damaged due to excessive current. An ammeter can be added between the power supply and the heating driver board to monitor the current.This induction heating circuit uses 12-48V low-voltage DC power supply, the maximum input current is 20A, the short-term maximum power is 1000W, and the long-term working power is 500-800W. It can be used for DIY players to do quenching, annealing and other heat treatment for small parts.This circuit can directly heat iron, carbon steel, graphite, titanium alloy, etc.Colour: as shownMaterial: metalPackage Contents:1 set * Heating machine (Parts, need to be installed by yourself)Only the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.