A power supply is a device that provides electric power to an electric load. Although their basic function is always to provide electric power, power supplies come in different shapes and are suitable for different applications. It’s important to understand the correct supply you need for your application. Once you’ve determined in which context you’ll be using your power supply, you can start getting into the more specific power supply functionality offered by different models. They tend to fall in the following categories: This is the most economical type of power supply because of its limited functions when compared to other types of supplies. Essentially, a battery eliminator acts in place of a battery. It provides DC power to devices that would normally be powered from an automobile battery or replaces various arrangements of 1.5V batteries and 9V and 12V batteries. It’s often used when servicing CB radios and automotive stereo equipment. If this is the type of power supply you’re after, our tip to you would be to look for the banana jacks to be spaced at 19mm (0.75 inches) so the dual banana plug adapters used with coaxial cables can be used. As its name implies, a constan...