If you’ve worked on a project with small LEDs, you know the frustration of determining their polarity. This ingenious LED Probe from [David] packs a lot of useful features into a simple, ...

In my so-far nearly 30 years of writing for EDN, I’ve learned a lot about my ever-evolving audience (i.e., you), at least two aspects of which are directly relevant to this particular writeup: Or take ...

At one time, holding a flashlight with your teeth—or borrowing the headlamp from your hiking kit—was the best solution to working in the dark or low-light conditions (think using mechanic tools under ...