Looking for a Cool Breathing LED light that you can control from a rotary potentiometer? Then this article will certainly guide you. Maybe you saw this circuit elsewhere but certainly you never saw it ...

Don't let poor lighting ruin an otherwise great photo. A portable LED fill light can add the extra dash of illumination you need, and if you don't want to pony up for a new one, you can make your own.

OK, it's not really a black light. It's better to call it what it is: ultraviolet light. Let's start with a quick overview of light. Of course, light is an electromagnetic wave (oscillating electric ...