I have used Red and Green LED’s. When node A is positive green LED glows while when node B is positive, Red LED glows. This indicates polarity of the input d.c voltage . 2) LED as a Continuity tester: ...

With an RGB (Red-Green-Blue) LED, literally you will be able to produce any color. At first glance, a 5mm RGB LED looks just like the regular 5mm LEDs, ... This lead will be treated as the “common” ...

[youtube= Mad Scientist Labs brings us this easy to make LED blinking circuit. The idea is to put a LED in series with a small blinking incandescent bulb from a string of Christmas lights. The bulb… ...

LED flasher circuit. With cycling safety in mind, I bought a pair of low power red LED things that replace the bungs in the end of drop handlebars. They are a neat way to get a bit of extra visibility ...

Oddly, the specs on the Red Magic aren’t actually quite in line with what you’d expect from a mobile gaming powerhouse. The 6-inch, 2160 x 1080 pixel display is up there, but it’s not a ...