About the length of the discharge arc: input voltage 12 V / 5A, the distance of the high voltage discharge arc is about 1-2 CM. The higher the input voltage and current, the higher the output power, the longer the distance of the discharge arc, when the input is a maximum of 30 V / 10 a, the distance may exceed 5 CM. If the arc is too short, check that the input power is sufficient. High-voltage package: The greater the power, the better. Driving the high-voltage package with ZVS is already overloading the high-voltage package. Therefore, breakdown damage is a normal phenomenon, not a high-voltage package quality problem, please try not to work for a long time under high power High-voltage winding: For the primary winding, please use 1.5MM square wire 5 turns + 5 turns (that is, 10 turns of center tap) in the same direction (please bring your own wire) Description: Input Voltage: DC 12 V-30 V Power requirements: less than 12 v greater or equal to 5a, above 15 v greater or equal to 15a Operating frequency: adaptive 30 KHz-50 KHz Secondary parameters: 5 T + 5 T Size: 74mm x 77.8mm For power: The output power circuit depends on the input power, if you only have 30 W of power, even if you want to be a ZVS with 200 W, it can not reach 100 W or 200 W, so the input power must be adequate, power = voltage x current! Colour: blue, black Material: plastic Package Contents: 3 x ZVS driver board