In this video you can see a homemade box to produce high voltage out of an industrial Battery (12V, 7A). Me and a friend built it. The arc (flash) can be max. 4 to 5 cm long, so the output has around 40 to 50 kV. There are also two knobs to change the output frequency of the square wave signal and to change the low-time... Depending on this settings the apparatus needs between 1 and 2 A. In this video the box is opened to repair the electronics which based on a NE555 timer. As you can see everything is working again so I decided to do some experiments, but normally this box is used to ignite things like gas in spud guns etc.
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