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: ...

This Design Idea describes a simple LED-lighting-effects circuit comprising only five chips and costing only a few dollars. When you first observe the circuit in action, you will think that it uses a ...

The datasheet confirms this current, which is less than 0.5 mA but sufficient to light a high-brightness LED to an unacceptable degree. The indication was not “sharp” enough for me.

LED lighting is more of an art than a science. There are myriad of LED types from which to choose and varying ways to arrange them. This gives room for lots of creativity.

For under $20 you can get a LED tester (look for TV back light tester) that’ll test anything from IR LEDs @ 1.2v up to 300v. Not sure why so high when TV back lights are usually around 100v.

Building simple circuits with copper tape, LED bulbs, resistors, and watch batteries is not as simple as you might think. Notre Dame Elementary School STEM students are putting the engineering desi… ...

Older designs relied on simple resistors to limit LED drive current, but designing an LED circuit based on the typical forward voltage drop as specified by a manufacturer can lead to overheating of ...

It's a simple string of miniature light bulbs, ... the LED light bulbs are also dipped in flux. ... The other type of circuit light strands use is a parallel circuit.

INDIANAPOLIS — Welcome to Home Zone! Today, we’re upgrading outdoor lighting with an easy and modern solution — plug-in LED lights. If you’ve been dealing with old, unreliable transformer ...