Digital Potentiometer Circuit using IC X9315

In this article we investigate the IC X9315 which is actually a solid state digital potentiometer and could be used exactly like a mechanical potentiometer, but through logical supply inputs. The IC X9315 from Intersil, is a digitally controlled solid state potentiometer, which internally possesses an array of resistors, wiper switches, a controlling system, and … Read more

How Electret Microphones Work

The post explains how electret microphone devices work, through appropriate diagrams and formulas. A microphone is a device designed for transforming weak sound vibrations into tiny electrical pulses, which can be then amplified through a power amplifier over a loudspeaker for achieving a louder reproduction of the sound. The most common and versatile form of … Read more

Force Sensing Resistor Explained

In this article we are going to see, what force sensing resistor is, their construction, specification and finally how to interface it with Arduino microcontroller. By: Girish Radhakrishnan What is force sensing resistor? A force sensing resistor senses the force applied to it and correspondingly changes its resistance. The resistance is inversely proportional to force. … Read more

Photoresistors and LDR (Light Dependent Resistors)

There are many different names by which the LDR (Light Dependent Resistors) are known as and includes names such as photoresistor, photocell, photoconductive cell, and photoconductor. By: S. Prakash In the domestic equipment industry, the term which is most prevalent and used at a large scale in the instructions and the data sheets is “photocell” … Read more