This easy-to-construct circuit causes a standard LED bulb to glow when infrared is detected by an infrared photo-diode or phototransistor. The third, remaining part, is a common 2N2222 (or ...

Such displays are commonly used in the watches and calculators. In the optical devices such as optocouplers. As on-off indicator in various types of electronic circuits. Some LED’s radiate infrared ...

This circuit uses invisible infrared light to detect the movement of people through the door. A short beep will be generated when the infrared beam breaks. So it is ideal to monitor the passages in ...

Many equipment manufacturers prefer protection circuits combining resettable overcurrent protection devices with upstream fail-safe protection. In this example, R1 represents a ballast resistor used ...