This course is to teach the principle, operation and characteristics of various electronic devices and their applications in electronic circuits. The objective of this course is to understand the concept, working and application of various electronic devices. The students should be able to use these devices for designing different circuits/products such as power supplies, amplifiers, oscillators and analysers.
When you take a block of silicon and dope part of it with a trivalent impurity and the other part with a pentavalent impurity, a boundary called the pn junction is formed between the resulting p-type and n-type portions.
You will learn how to use a voltage to cause the diode to conduct current in one direction and block it in the other direction.This process is called biasing.
As you have learned, forward bias produces current through a diode and reverse bias essentially prevents current, except for a negligible reverse current. Reverse bias prevents current as long as the reverse-bias voltage does not equal or exceed the breakdown voltage of the junction. In this section, we will examine the relationship between the voltage
and the current in a diode on a graphical basis.
You have learned that a diode is a pn junction device. In this section, you will learn the
electrical symbol for a diode and how a diode can be modeled for circuit analysis
using any one of three levels of complexity
Because of their ability to conduct current in one direction and block current in the other
direction, diodes are used in circuits called rectifiers that convert ac voltage into dc voltage.
Rectifiers are found in all dc power supplies that operate from an ac voltage source
You will learn about two types of full-wave rectifiers: center-tapped and bridge.
Diode circuits, called limiters or clippers, are sometimes used to clip off portions of signal
voltages above or below certain levels
Another type of diode circuit, called a clamper, is used to add or restore a dc level to an electrical signal
In this section, you will see how the zener diode maintains a nearly constant dc voltage under the proper operating conditions.
Mr. Usman Ali has done Electrical Engineering.
He has done Teacher Assistant in different subjects of Electrical Engineering Electrical Circuit Analysis,Electrical Circuit Design ,Electronic Circuit Design,Electronic Circuit Design and Digital logic Design and Gates.
He has one year experience in robotics and embedded system .
Currently he is working as a industrial automation engineer.
His goal is for students to learn Electrical Engineering in the most straight forward, simple and easiest way.