This power supply puts out 24V DC if plugged directly into the wall
socket or 0 - 24V DC if plugged into a variac that feeds it 0 - 120V AC.
I made this power supply from scratch using plans on the
Low Voltage Power Supply section of Samuel M. Goldwasser's
high voltage generator page. Initally I'd intended it just for powering a
30kV high voltage power supply but I've
since found plenty of use for the low voltage range, 0 to 24V. The
output is through banana plug connectors.
The 24V power supply is on the left.
The red thing on the right is a variac. Plug it into the wall and it
gives you AC output in the range 0 - 120V. I plug the 24V power supply
into the variac.
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Inside view. Even the case is homemade.
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