It’s not entirely clear why [Advanced Tinkering] needs a 50,000-volt power supply ... Powered by a 24-volt DC supply and an adjustable DC-DC converter, that setup alone yields something around ...

[Nerdz] wanted a power supply ... and adjustable. He built a custom board that plugs directly into the breadboard’s power rails. It has a pot attached to the ground of a 7805 voltage regulator ...