They usually need a high-voltage mains transformer and a rectifier ... looking at the circuit of a typical oven, which uses a single diode and a capacitor in a simple voltage multiplier.

A design of voltage doubler circuit has been studied in context of electromagnetic energy harvesting using 28 nm FD-SOI technology. After analysis of the operating constraints of the circuit, the ...

Their benefits are such that it’s become surprisingly rare to see a traditional linear power supply with a mains-frequency transformer and rectifier circuit, so [ElectroBoy]’s dual voltage PSU ...