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 , the 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 the input is sufficient. High-voltage package: The greater the , 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 High-voltage winding: For the primary winding, please 1.5MM wire 5 turns + 5 turns ( is, 10 turns of center tap) in the direction (please bring your own wire) Description: Input Voltage: DC 12 V-30 V 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 : The output circuit depends on the input , if you only have 30 W of , even if you want to be a ZVS with 200 W, it can not reach 100 W or 200 W, so the input must be adequate, = voltage x current! Colour: blue, black Material: plastic Package Contents: 1 x ZVS driver board Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.