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Electronics Theory

What are the Different Types of Transformers? Explained

Last Updated on May 20, 2026 by Swagatam 39 Comments

transformer turns

In this post I am going to explain different types of electrical transformers that are used in a wide variety of applications. Transformers can be classified in many different ways, for example: based on their input / output character, voltage, frequency, application, power handling capacity etc.  In this post we will be exploring all the […]

Filed Under: Electronics Theory Tagged With: Different, Explained, Transformers, Types

Solving Darlington Transistor Formulas and Calculations

Last Updated on May 20, 2026 by Swagatam Leave a Comment

Now in this post you will learn about this amazing BJT device which is called Darlington Transistor. It got this name after genius engineer Sidney Darlington who first gave this idea, so we remember him. What Is Inside Darlington Transistor Basically this device is like special combo of two normal NPN or PNP bipolar junction […]

Filed Under: Electronics Theory Tagged With: Calculations, Darlington, Formulas, Solving, Transistor

FET Current Source: Explained with Formulas

Last Updated on May 20, 2026 by Swagatam Leave a Comment

An FET Current Source is one special type of active circuit that is using a Field Effect Transistor for giving a steady and constant current into a circuit. We are doing this because sometimes we want that current should not change, it should remain fixed and stable. Why We Need Constant Current Now you may […]

Filed Under: Electronics Theory Tagged With: Current, Explained, FET, Formulas, Source

How to Make Logic Gates using Transistors

Last Updated on May 20, 2026 by Swagatam 12 Comments

1

In this post I have explained how to build NOT, AND, NAND, OR, and NOR logic gates using discrete transistors. The main advantage of using transistor logic gates is that they can work even with voltages as low as 1.5 V. In some electronic applications the available voltage may be inadequate to power TTL or […]

Filed Under: Electronics Theory Tagged With: Gates, Logic, Transistors

Point Contact Diodes [History, Construction, Application Circuit]

Last Updated on May 20, 2026 by Swagatam Leave a Comment

oa79 germanium diode

In this article I will comprehensively explain about the early point contact diodes, and their modern versions which are Germanium diodes. Here I have explained the following facts: Brief history of point contact diodes Construction of point contact diodes and modern Germanium diodes Advantages of point contact diodes or Germanium diodes Applications of Germanium Diodes […]

Filed Under: Electronics Theory Tagged With: Application, Construction, Contact, Diodes, History, Point

DPDT Relay Working, Pinouts, Testing Explained

Last Updated on May 20, 2026 by Swagatam 2 Comments

In this post we are going to understand about how this DPDT relay actually works, how we identify its pinouts, and how we can use it in our projects. We shall go step by step so that you can feel confident with every small thing about it. Introduction We know that a DPDT relay means […]

Filed Under: Electronics Theory Tagged With: DPDT, Explained, Pinouts, Relay, Testing, Working

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