Recently, I was working on a project that needed a couple of LEDs on its front panel for status indication. I realize many, if not most, pieces of electronic equipment now use graphic LCDs, Bluetooth ...

Intended for use as power, status, or warning indicators in panel applications, the 558 Series LED indicators have 3-mm emitters in a snap-in mount that fits in a 0.156-in. hole. The daylight-visible ...

I needed a simple LED indicator showing that a particular voltage level had been reached—specifically, that a capacitor had charged to a particular potential. I was convinced that there must be a way ...