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.
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.
Below is the schematic. If you're not familiar with reading schematics
then see my page all about
In the photos above you can see a red cylindrical
shaped object that's called a Variac, also known as a variable AC
transformer. It's not shown in the schematic. It allows you to vary
the input voltage from 0 to 115 volts AC, which then varies the
output voltage from 0 to 24 volts DC. The power from the wall socket
goes into the Variac, and from the Variac to the power supply.
24 volt power supply schematic.
Inside view. Even the case is homemade.
Label from the transformer.