These modules are widely sold on eBay as high voltage pulse generators with grossly inflated output voltage figures like 400kV. They put out closer to 20-40kV as 400kV would probably jump about 150mm/6" in dry air.
They are so cheap and mass produced that they must be from a common product, so I decided to test if they were for stun guns by touching the output....
Here's an eBay search link for these interesting modules.
https://www.ebay.com/sch/i.html?_from=R40_sacat=0LH_BIN=1_nkw=400kv_sop=15
If yo
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