A homemade 7KV firework igniter using a 3v to 7000v boost converter from eBay.
I’m feeding the boost converter with an 18650 battery, anywhere from around 3V to 4.2V.
It produces quite a nice high voltage arc, with adjustable distance. Although this design doesn’t lend itself to a large arc distance due to the placement of the paperclips.
A better design would be to glue the paperclips to the side of the battery holder so there’s a good distance between them and to ensure the arc appears where you’d intend it to.
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