The Complete Guide to LEDs (Light Emitting Diodes)

Red, Green and Blue LEDs An LED, which stands for Light Emitting Diode, is an durable electronic device that efficiently emits a bright light in a huge variety of colors. LEDs were introduced as an electrical component on the 1960s, and today are being increasingly used in place of other light sources for everything from flashlights to computer monitors. Thanks to their low power requirements and long lifespan (measures in tens if not hundreds of thousands of hours) LEDs are seen as reliable and environmentally friendly.

This guide takes a look at the many different applications of LEDs, as well as providing some practical tips for creating your own LED based appliances.

Make this Useful Emergency Light using 'Cool' White LEDs Using a combination of a group of high efficiency white LEDs and a unique voltage controller circuit, an almost ideal LED emergency light circuit can be constructed. Let's look...	Generating Electricity from a Bicycle Dynamo The proposed mini-electricity generator project is very simple to build and can be used by students for displaying in school exhibition programs. The set up can be used for charging...
Purchasing the Best New TV for the Money Here, we cover the best of the best in LCD, LED, Plasma, 3D and giant screen TVs. Whether you are looking for a set to put in your kitchen or the centerpiece for a new home theater...	Build Yourself a Simple Continuity Tester If you don’t want to use the cumbersome multimeters for tracing out simple faults like short circuits, continuity or resistance inside PCB assemblies and wirings, then perhaps...

Make this Useful Emergency Light using 'Cool' White LEDs

Using a combination of a group of high efficiency white LEDs and a unique voltage controller circuit, an almost ideal LED emergency light circuit can be constructed. Let's look at the procedure involved...

A Simple Battery and Light Bulb Circuit Experiment

A very amusing and simple experiment using few batteries and a light bulb will quite effectively explain how to light up a torch bulb or a LED. School students will especially love it. Read on to learn...

Build Yourself a Simple Continuity Tester

If you don’t want to use the cumbersome multimeters for tracing out simple faults like short circuits, continuity or resistance inside PCB assemblies and wirings, then perhaps the circuits described...

Make a Plug-In Emergency Light with a Li-Ion Battery

In an emergency rechargeable light circuit, an automatic charging facility becomes imperative, especially when a Li-Ion battery is involved. The complete construction procedure of a plug in emergency light...

Over Voltage And Low Voltage Protection Circuits: Easy Home Projects

The article describes few useful protection circuit designs that can be easily built and installed in your domestic power line. These will provide an excellent over voltage protection to all the connected...

Simple LED Flashlight Explained

A commercially available, cheap mini LED torch may typically be comprised of a white LED, a few button cells and a switch mechanism. One such sample has been diagnosed here. The studied...

Green Christmas: Low-Energy Lights

The best environmentally friendly option that we have when it comes to saving energy and still getting into the holiday spirit of lighting up our holidays is by converting to LED use...