In the optical devices such as optocouplers. As on-off indicator in various types of electronic circuits. Some LED’s radiate infrared light which is invisible. But such LED’s are useful in remote ...

This is a simple flashing led circuit with 2 leds and 2 NPN transistors. It illustrates the behavior of transistors and capacitors and if you use an oscilloscope it will be very easy to determine what ...

Instead of simply replacing the outdated bulb, we decided to build a small dark detecting circuit with 2 yellow LEDs based on this Evil Mad Scientist Laboratories design. After successfully ...

To incorporate LEDs into your favorite accessories, you’ll start by creating a basic circuit from a battery, two pieces of wire, and an LED. You’ll then modify this circuit so that you can turn it on ...

But when you turn off the LED bulb, there's still some amount of current in the circuit. Since LEDs require so little power to function, even that tiny current can cause the light to glow for a ...