Build Instructions

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• 1

  Introduction

  Hey, what's up, Guys! Akarsh here from CETech.

  Today we are going to get some knowledge about the powerhouse of the small in size but much bigger in work transistor circuits.

  Basically, we are going to discuss some basics related to the transistors and after that, we will be looking over some useful knowledge about a specific type of transistors series known as the BD139 and BD140 power transistors.

  And towards the end, we will also discuss some technical specifications. I hope you are excited. So let's get started.

• 2

  Get PCBs for Your Projects Manufactured

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  You get 10 good quality PCBs manufactured and shipped to your doorstep for cheap. You will also get a discount on shipping on your first order. Upload your Gerber files onto PCBWAY to get them manufactured with good quality and quick turnaround time. Check out their online Gerber viewer function. With reward points, you can get free stuff from their gift shop.
  

• 3

  What Is a Transistor

  A transistor is the basic building block of all the electronic circuits that are used nowadays. Each and every appliance present around us contains transistors in it. We can say that Analog electronics is incomplete without a transistor.

  It is is a three-terminal semiconductor device used to amplify or switch electronic signals and electrical power. It is composed of semiconductor material usually with at least three terminals for connection to an external circuit. A voltage or current applied to one pair of the transistor's terminals controls the current through another pair of terminals. Because the controlled (output) power can be higher than the controlling (input) power, a transistor can amplify a signal. Today, some transistors are packaged individually, but many more are found embedded in integrated circuits.

  Most transistors are made from very pure silicon, and some from germanium, but certain other semiconductor materials are sometimes used. A transistor may have only one kind of charge carrier, in a field-effect transistor, or may have two kinds of charge carriers in bipolar junction transistor devices.

  Transistors are composed of three parts ' a base, a collector, and an emitter. The base is the gate controller device for the larger electrical supply. The collector collects the charge carriers, and the emitter is the outlet for those carriers.
  

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