Computer powers supplies are readily available and make a good 12 volt or 5 volt power supply. The only thing is when they are not connected to a computer you need.
Computer Power Supply to Bench Power Supply Adapter (Makezine)
Bench power supplies are boxes that you plug into the wall, and provide an adjustable range of DC voltage on their output terminals. They usually have some knobs and.
This article describes you how to design a variable power supply circuit which will provide 0 to at 6 to 8 amps.
Picture of Switched Mode Dual Variable Power Supply
Image titled Create a 12 Volt DC Test Bench for Bullet Cameras Using an Old ATX Computer Power Supply Final
Hello all and welcome to my first Instructable.I've always wanted a bench PSU for easy access to a power source, and something that I can rely on when working on various projects. I wanted a PSU that: