This project shows you how to make a massive 30kV voltage multiplier from scrapped microwave parts.

This might be useful if you have a need for some serious voltage power for building projects like a high voltage plasma ball or even a high voltage chair. It is a voltage multiplier circuit built from diodes and capacitors of 30 microwave ovens. It can be used for many high voltage experiments, like HV lifters or as supply for a Marx generator.

They are inexpensive, easy to design, versatile, and can provide virtually any output voltage that is an odd or even multiple of the input voltage. Might be interesting if you made one for yourself.