15KV High Voltage Inverter Coil Module

Today I tell you my experiences with a rather simple kit from the Far East for soldering and give you hints on how to successfully complete this malicious kit. Please allow 30 minutes for handling soldering and hot glue pistol.

The fireworks firing on New Year's Eve often fails due to the simple lighters that can ignite the fireworks neither in wind nor in rain.

This is now with the kit WP1707 (141480), which created a high voltage (therefore the danger to life) remedy.

Preparation: Soldering the PCB

Take the few parts to hand and solder them on the PCB according to the symbols. Pay close attention to the orientation of the diode (D1), since it is a one-way street of the current that the imprint of the diode - a small bar - in the right direction. The resistance (R1 with 120 ohms) does not matter.

Crucial is still the orientation of the transistor: this is called NPN - one could conclude that the alignment does not matter, but mean the two "N" something completely different. It is correct if the metal surface points towards the heat sink.

Pro Tip

Often it comes with the coil to the problem. Not the 4 ends on the 3 holes are problematic as the symbols are still reasonably clear (hole 1 thin wire, hole 2 thin and thick wire (the two clear wires and hole 3 thick wire).

Check A: The thing is the wire itself: this is covered with a clear coat and so only conductive in the end. If you push the wires too long through the holes and try to solder them, no solder will stick to them. You should use a suitable tool (Dremel or simple knife) to remove the clear coat layer - the difference will be visually recognizable.

It would also work to solder the wire ends to the hole itself.

Check B: I have strengthened the cables for the power supply and used no simple jumper wire. In the first attempts, it was very warm here and the cables should not melt away. A Lipo battery with 3.7V with its 2000 mAH is sufficient as a power source. It should also work with less mAH.

Some PINs are included in the pack so you can solder your cable to the PINs.

Check C: Use these pins for the thin wires at the end of the coil. With its black plastic separator you can extend the cable ends and bend the two pins with a pair of pliers something. Here then the arc jumps over. Attention: High Voltage! Danger!

Check D: I applied some hot glue to make sure that the arc appears at the desired end and not in front of the black PIN separator. Do a little more work, but the result is more predictable.

Check E: For some sets there is still a cable tie: uses this to fix the coil or also uses a drop of hot glue for fixation.

Helpful Video from Other Makers

(German speaker):

Alternative

If you are not equipped with the "Jugend forscht" gene, you can also buy a handy USB-powered lighter from the mail order company around the corner.

Equipped with it, the next fireworks can come up: until then I wish you a nice summer!