What is Transistor | How Transistor Works | Types of Transistor | BJT Transistor | FET Transistor | How Transistor is works as an Amplifier |

 Friends, in today’s time, we use different types of Gadgets to make our life comfortable, such as Mobile, Camera, Laptop and many other types of Gadgets we use, and all these Behind the working of Electronic Gadgets, there is a role of a very important small component which is called Transistor?

So in today’s blog post, we will know what is a transistor in Hindi, how the transistor works, how many types of transistors are there and where are transistors used, so let’s see?


What material is the transistor made of?

Before knowing what is a transistor, let us understand what material the transistor is made of, the transistor is made of semiconductors?

All the elements we get from nature are divided into 3 categories?

First Metals i.e. Conductor and second Non-Metals i.e. Insulator and third Semiconductor?

Conductors are those materials that allow current to flow inside them such as silver, copper, gold, etc.?

Insulators are those materials that do not allow current to flow inside them such as Plastic, Rubber, Wood, etc.?

Semiconductors are those materials that allow current to flow through them or not. Yes? Semiconductors allow current to flow through themselves whenever the temperature is high?

So now let’s assume that if we have made any component from this pure semiconductor i.e. from Silicon or Germanium, then whenever that component will work when the temperature is high, then there can be a lot of problems in such a situation?

So to avoid this problem, we use the doping process, in the doping process, we add some impurities to the pure semiconductor, which by adding boron or antimony impurity, the electrons inside the semiconductor are either reduced or else become too much?

So after doping, we get 2 types of semiconductors?

1) P-type Semiconductor

2) N-type Semiconductor

Now the Diode is formed by sandwiching the layers of these 2 Semiconductors i.e. P-type and n-type and when the layers of these 3 Semiconductors are sandwiched together, then the Transistor is formed?

What is Transistor? What is Transistor |

A transistor is such a 3 terminal electronic component which is made up of 3 semiconductor layers PNP or NPN and its function is Digital Switching or Amplifying a weak signal These are the 2 functions of Transistor?

An important fact Transistor is also called ‘Heart’ of Electronics?

How many types of transistors are there?

Transistor has been classified into 2 parts?

1 ) BJT ( Bipolar Junction Transistor )

2 ) FET ( Field Effect Transistor )


After this, the FET (Field Effect Transistor) has been further classified, let’s see that too?


So these are all types of transistors, most of them use BJT and MOSFET is used in FET? In this blog, we will discuss BJT in detail?

 Types of BJT (Bipolar Junction Transistor) |

Before knowing the types of BJT, let us understand what are the names of Pinout of BJT Transistor?

Transistor has 3 pins because the transistor is made up of 3 semiconductor layers? What are the names of Pinout?

  • Emitter
  • Base
  • Collector

The emitter is most highly doped while the collector is moderately doped and the base the most lightly doped. Doping means how many charge carriers are there in it?


There are 2 types of BJT (Bipolar Junction Transistor):-

1) PNP Transistor

2) NPN Transistor

1) PNP Transistor: As the transistor is made of semiconductor, then PNP transistor has 3 layers of semiconductor inside it, 2 layer p-type semiconductor i.e. emitter and collector pin to transistor?

 And of 1 layer n-type semiconductor which is the base of the transistor? The symbol of the PNP transistor is the arrow inwards?




2) NPN Transistor: As the transistor is made of semiconductor, then there are 3 layers of semiconductor inside NPN transistor, 2 layers n-type semiconductor i.e. emitter and collector pin of transistor?

 And of 1 layer p-type semiconductor which is the base of the transistor? Is the use of NPN transistor slightly more than that of PNP transistor? The symbol of the NPN transistor is the arrow facing outwards?



How Transistor Works | How Transistor Works |

Friends, before understanding the transistor, we understand how a diode works, so the work of a diode is to make the current flow in the same direction? Yes?

 If we connect a battery with a led and put a diode with the battery, then in this condition the diode will allow the current to flow in only one direction?


Because the current has reached the LED through the diode, that’s why?

Now let’s talk about how the transistor works, to understand this you see a photo below? It is shown in this animation that it has a BC547 NPN transistor. This transistor has 3 terminals Emitter, Base, and Collector.

The emitter is connected to the negative terminal of the battery and the collector is connected to the positive terminal some extra supply has been given in the base as well, why will we discuss that further?


Now as you saw in the first example that the diode was making the current flow in the same direction i.e. if the current was given in its anode, then the current came out from the cathode, was it working of the diode?

But here the case in Transistor is such that we have to transfer the current from emitter to collector, but now we have seen in the animation above that the battery is connected to the transistor, yet the current is not going from the emitter to the collector,

So here the current is not going to the collector because it also has a base, now pay attention here that whenever the current will flow in the transistor, when we give it even in a small signal base, yes? You heard it absolutely right in the animation above that when the base switch is ON, then only the current is coming out of the collector, otherwise no?

So here we understand from this that the Base plays a very important role in the operation of the transistor, when current is given in the base, only then the current will come out of the collector and the transistor will operate?

So here the transistor works like this ie by controlling the signal of a small base, we can control the whole transistor? So this is the biggest advantage of using a transistor?

So here the transistor is working as a digital switch?

That’s why we use transistors in computer processors where a lot of signals have to be in and out, similarly to logic gates?

How Transistor Works as an Amplifier |

What we discussed above was that the transistor was working as a digital switch but the transistor can also work as an amplifier, let’s see how they came?

Amplifier means to amplify a Weak signal i.e. to increase the Amplitude of that signal?

As when you speak in a hall without Mic, then there is not enough Amplitude in your voice that it can be heard by all the people, so to avoid this problem we use Amplifiers?

And Amplifiers are used in Transistors that amplify the signal?


That is, there is a Mic in which someone is speaking, his signal is small and this small signal goes to Amplifiers to be Amplified, and when this signal is big then it is given to Speakers?

 As you can see this same thing in DJ, the signal of a song comes out from mobile, it is not so powerful, later amplify the same signal and give it to big speakers?

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