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 the distance of the discharge arc, when the input is a maximum of 30 V / 10 a, the distance may 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, try not to work for a long time under High-voltage winding: For the primary winding, use 1.5MM square wire 5 turns + 5 turns (that is, 10 turns of center tap) in the same direction ( bring your own wire)Description:Input Voltage: DC 12 V-30 VPower requirements: less than 12 v greater or to 5a, above 15 v greater or to 15aOperating frequency: adaptive 30 KHz-50 KHzSecondary parameters: 5 T + 5 TSize: 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 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, blackMaterial: plasticPackage Contents:1 x ZVS driver boardOnly the above package content, other products are not included.Note: Light 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.