Electrical4U 
Negative Feedback in Op Amp We obtain Negative feedback in an op amp by connecting output terminal of an op amp to its inverting input terminal through a suitable resistance as shown below.The gain of an op amp with negative feedback is called closed loop gain. Closed Loop Gain of Op Amp When we connect … Read more
A Zener diode is a specially designed diodes device made to run in reverse breakdown. These diodes are more heavily doped than ordinary rectifiers, so low-voltage types have a thin depletion region. A rectifier diode is not rated for continuous reverse breakdown voltage. A Zener diode is. The junction recovers when the reverse voltage is … Read more
The pressure difference from a chimney includes chimney height. Enough natural draught therefore needs a taller stack, which is not always practical. In those cases the plant uses artificial draught instead of stack height alone. Artificial draught comes from fans, blowers or a steam jet. Steam-jet draught is an older method. Fan draught is the … Read more
An op amp is extensively used as the main building block of a Digital to Analog Converter (DAC). A DAC is an electronic device in the form of an IC that converts digital signals to equivalent analog signals. DACs can be realized in many ways. One popular DAC circuit is the binary weighted ladder.This DAC … Read more
What is a Line Reactor? A line reactor, also called an electrical reactor or choke, is a coil used with variable frequency drive (VFD). As current flows through the coil, it creates a magnetic field that slows the rise of current, reducing harmonics and protecting the drive from power surges and transients. Types of Electrical … Read more
Metals like silver, copper and aluminum have many free electrons, making them good conductors with low resistance. However, their resistivity changes with temperature. Generally, metals have higher electrical resistance when the temperature increases, while non-metallic substances usually show decreased resistance with higher temperatures. Take a piece of pure metal, cool it to 0°C using ice, … Read more
Differentiator is an op amp based circuit, whose output signal is proportional to differentiation of input signal. An op amp differentiator is an inverting amplifier with a capacitor at the input terminal. The basic circuit diagram illustrates this setup. We will first assume that the op amp used here is an ideal op amp. We … Read more
“Maintenance” as the name suggests it is the action necessary for retaining or restoring a piece of equipment or machine to the specified operable condition to achieve its maximum useful life. Induction motor maintenance is the work that keeps a motor in a specified operable condition for its useful life. Maintenance of these machines falls … Read more
The two main types of electrostatic precipitator used on electrical power and other electricity plant gas streams are dry and wet. Coal power plants still use them widely, though coal is not the only fuel mix and a baghouse is another common particulate control. An Electrostatic precipitator charges particles in a flowing gas and collects … Read more
An operational amplifier, or op amp, can perform a summing operation in addition to amplifying. This allows us to design a circuit that combines several input signals into a single output, creating a weighted sum of these inputs. Summing amplifier is basically an op amp circuit that can combine numbers of input signal to a … Read more