An Example of a voltage multiplier. The output varies by the diodes and capacitors used.
Input: 120 VAC 1mA
Output: ~600 VDC
A voltage multiplier is an electrical circuit that converts AC electrical power from a lower voltage to a higher DC voltage, typically using a network of capacitors and diodes.
You can find more info here: https://en.m.wikipedia.org/wiki/Voltage_multiplier
IMPORTANT: NEVER USE ELECTROLYTIC CAPACITORS WITH AC SIGNALS OR YOU RUN THE RISK OF AN EXPLOSION