Today I took a look at the crazy MC105 "400kV" DC high voltage step-up boost inverter from Ebay. The actual voltage may be about 20-30kV. The module created about 2-3cm long very bright and very loud sparks, then it stopped working after several seconds. I've made an autopsy of it and managed to reverse engineer the full schematic, despite it's not easy with a resin filled module. It's a self-oscillating circuit (similar to a joule thief) with a single transistor and a high voltage transformer. At the secon
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