Recently, I wanted to build a Sleepy-LED Eye as an add-on indicator for a small personal project. My idea is a near-replica of the iconic breathing pattern used for the “sleep” indicator in Apple ...

If you’re working with 3.3V or 5V circuits, it’s easy for you to throw on a power or status LED here or there. [Tom Gralewicz] has found himself in a pickle, though, often working on projects with ...

This LED DC voltage indicator circuit is a voltmeter, rather than simply a battery tester. As such it may measure voltages as low as 3V. It utilizes venerable LM741 operational amplifiers applied as ...

A fan to remove fumes is a handy thing to have when soldering, even better is a fan furnished with a filter. Better still is a fan that activates only when the iron is in use, turning off when the ...

The subject of the little LED indicator light on HTC Windows Phones has cropped up in a few of the WPCentral Forums discussions. Some are pleasantly surprised at seeing the little indicator, some are ...

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 ...

Do you keep any electronics in your bedroom? All the experts say you aren’t supposed to. But my bedroom often doubles as my office, and that means lots of electronics with distracting LED status ...

While some netbook makers *cough* *MSI* *cough* seem to feel the need to throw so many status LEDs on their case that it’s tough to tell what any individual blinking light means at a glance, others ...

If you are experiencing issues with your ASUS PC, you can troubleshoot the problem by viewing the status of the Q-LED indicators. This article shows how to troubleshoot ASUS motherboard with Q-LED ...