The Optoelectronics group of Vishay Intertechnology has introduced a new automotive-grade, 4-quadrant silicon PIN photodiode in a standard surface-mount package. Enabling a variety of sensor and control applications for the automotive, consumer, and industrial markets, the Vishay Semiconductors K857PH combines high photo sensitivity with low 0.1 % crosstalk and virtually no tolerance between its segments. The…
What are the different types of diodes?
A diode is the most basic semiconductor device. Yet, it has endless applications. In semiconductor electronics, the p-n junction as a basic diode serves as the foundation for all other sophisticated semiconductor components and their design. The design principles that apply to a semiconductor diode are the same applies to transistors and other components. Interestingly,…
Light sensor using photodiode and opam
The project about light sensor circuit shows the application of photodiode to detect the presence of light. This light sensor can be used as an intermediate circuit [[wysiwyg_imageupload::]]in various applications to detect the presence or absence of light. The sensitivity of the sensor can be adjusted using the preset. This circuit is based around a LM339 comparator along with variable capacitors, photodiode, LED and a solo resistor. A photodiode, used as a photo detector, generates current in the circuit when light incidents on it. The circuit of this project uses the photodiode in reverse bias mode with resistor R1. The LED at the output will glow when light falls on the diode. In such a condition, the inverting input drops to a lower value than the reference set at the non-inverting input and so the output goes providing the necessary forwards bias to the LED.