I'd like to double the 150–220VDC 50mA supply from this Nixie power circuit, for use with electrowetting, but I'm not sure of the best method. Most boost converters I've seen require a low input voltage, and I haven't seen any other circuits that do DC-DC voltage multiplication (though I am almost completely new to electronics).
This seems like a super-simple question, and I'm sure it has a simple answer. Are there just higher-rated components out there I should use? Anything that isn't a big box that requires a quote?