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 ...

Here’s a simple project for your Halloween celebration ... we decided to build a small dark detecting circuit with 2 yellow LEDs based on this Evil Mad Scientist Laboratories design.

Older designs relied on simple resistors to limit LED drive current, but designing an LED circuit ... to protect against damage resulting from electrical shorts, overloaded circuits or customer misuse ...

Figure 1. A Simple Over-Voltage Protection Circuit for LED Drivers This boost circuit implements current mode control and senses the LED current via resistor R14. The output voltage is boosted to just ...