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.

Here it is all connected together powering my 30kV power supply which is on the left. The red tube thing at the back is a Fluke 80k-40 40kV high voltage probe which is feeding the analog meter on the right.

Below is the schematic. If you're not familiar with reading schematics then see my page all about reading schematics.

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.

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