I’d also like to see the schematic. I make a tiny 3V to 200V converter for my Nixie watches, but it uses a flyback transformer and a tripler.
It’s rather difficult to make such a boost supply using only an inductor, since the gate of any MOSFET that can handle the 200V drain voltage pulse is not likely to be switched on cleanly by the measly 5V available on USB.
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