Capacitors with unique construction and failure modes are placed on the AC line to manage EMI modes and ensure user safety.

The be quiet! Power Zone 2 750W offers excellent efficiency, cooling, and power pass through to ensure your system gets the consistent power it needs to operate at peak performance.

Issues include fan blade pitch and speed, hub size, venturi depth, bearing quality and layout of power supply components. Acoustical noise is measured ... back to zero. AC voltage superimposed ...

It’s not entirely clear why [Advanced Tinkering] needs a 50,000-volt power supply ... architecture of the supply is pretty straightforward, with a ZVS driver and an AC flyback transformer.

As for noise, consider that a fully functional power supply will probably be loud if it's close to its rated load. Here are some baseline rough estimates; we recommend you look up the peak power ...