Not wanting to spend the money on a dedicated power ... ATX computer power supply. These ATX supplies are actually a little finicky when not used in a computer, as [C] found, with voltage drops ...

For something with a little less refinement, less safety, and a much higher voltage output, though, take a look at this power supply which tops its output voltage around 30 kV.

A power supply for electronic devices. Also called an "AC adapter" or "charger," power adapters plug into a wall outlet and convert AC to a single DC voltage. Computers use multiple DC voltages ...