Use of NPN Transistor as a Switch circuit

A switch or key is useful to activate or deactivate a device. For example, if we want to ON or OFF a fan or a TV or a Tube light we need to press on switches. Sometimes, in physics laboratory, we use tapping keys to connect the circuit to get a current flow. These all … Read more

Darlington pair amplifier Transistor – circuit, theory & gain

We know that a Transistor can amplify the electric current at its output. Often, the amount of the amplified output does not meet the required criteria. That means we need the output current more than that. Then scientist Darlington proposed a new circuit arrangement with two coupled transistors which provides a huge current gain. This … Read more

Input and output characteristics of a Transistor

In another article, we have discussed the Bipolar Junction Transistor and the differences between NPN and PNP transistors. Transistor characteristic curve is a very useful thing to understand the basic principle and operation of a Transistor. In this article, we’re going to discuss the input and output characteristics of a Transistor. The main discussion is … Read more

Introduction to BJT Transistor – NPN and PNP

Bipolar Junction Transistor (BJT) is one of the very important electronic circuit components in the world of electronics. Scientist William Shockley discovered the first Transistor in 1948. Modern technology is very much progressive and many varieties of transistors have been discovered. These transistors are widely used in analog and digital electronics. In short, semiconductor diodes … Read more

Differences between NPN and PNP Transistors

Transistor is one of the basic circuit components for electronic devices. The main purpose of a Transistor is to Amplify electronic signals. There are two types of BJT Transistors – NPN and PNP. In another article, we discussed the construction, symbol and other properties of BJT Transistors. In this article, we’re going to discuss the … Read more