This induction heating circuit using a 12 v - 48 v (36 v power supply cooling fan must separate power supply) low voltage dc power supply, the maximum current 20. A, maximum power 1000 w. Because of its power is moderate, can be used for DIY players to make small parts quenching, annealing and other heat treatment, also can match the graphite crucible melting gold, silver, copper, aluminum and