A benchtop power supply is a key thing to have for any aspiring electronics hacker. While you can always buy one, plenty of us have old computer PSUs ... plugs outputting +12V, -12V, +5V, and ...

As the ATX PSU standard moved from the old 1.x revisions into the current 2.x revision range, the -5V rail was removed, and the -12V ... power supplies (SMPS) like those used in any modern compute ...