What Is Transistor And Its Types Pdf

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what is transistor and its types pdf

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As our brain is made up of billion of cells termed Neurons which are used to think and memorize things. Like as computer also have billions of tiny brain cells named Transistors. It is composed of chemical element extract from sand called Silicon.

Well, with modern-day transistors like the BC, 2n, 2n, etc. For an NPN transistor, it consists of a layer of P-doped semiconductor between two layers of N-doped material, where electrons are passed from the emitter to the collector instead. The emitted electrons are finally collected by the collector and sent to the following part of a circuit. Whereas for a PNP transistor, it consists of a layer of N-doped semiconductor between two layers of P-doped material, where the base current entering into the collector is amplified.


A transistor is a semiconductor device used to amplify or switch electronic signals and electrical power. Transistors are one of the basic building blocks of modern electronics. 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. Austro-Hungarian physicist Julius Edgar Lilienfeld proposed the concept of a field-effect transistor in , but it was not possible to actually construct a working device at that time. The three shared the Nobel Prize in Physics for their achievement.

There are many types of transistors in use. Each transistor is specialized in its application. The main classification is as follows. Let us have a look at the BJTs. This BJT is nothing but a normal transistor. Usually NPN transistor is preferred for the sake of convenience.

They are used in a variety of circuits and you will find that it is rare that a circuit built in a school Technology Department does not contain at least one transistor. Most circuits tend to use NPN. There are hundreds of transistors which work at different voltages but all of them fall into these two categories. The BASE - which is the lead responsible for activating the transistor. The diagram below shows the symbol of an NPN transistor.


This page covers practical matters such as precautions when soldering and identifying leads. Transistors amplify current , for example they can be used to amplify the small output current from a logic IC so that it can operate a lamp, relay or other high current device. In many circuits a resistor is used to convert the changing current to a changing voltage, so the transistor is being used to amplify voltage. A transistor may be used as a switch either fully on with maximum current, or fully off with no current and as an amplifier always partly on. The amount of current amplification is called the current gain , symbol h FE one of many parameters for transistors, each with their own symbol.

Definition: The transistor is a semiconductor device which transfers a weak signal from low resistance circuit to high resistance circuit. The words trans mean transfer property and istor mean resistance property offered to the junctions. In other words, it is a switching device which regulates and amplify the electrical signal likes voltage or current. The transistor consists two PN diode connected back to back. It has three terminals namely emitter, base and collector. The base is the middle section which is made up of thin layers.

DC Operation of Bipolar. Junction Transistors (BJTs). • There are two types of BJTs, the npn and pnp. • The two junctions are termed the base-emitter junction.

Different Types of Transistors and Their Functions

The transistor is an active component and that is establishing all over electronic circuits. They are used as amplifiers and switching apparatus. As the amplifiers, they are used in high and low level, frequency stages, oscillators, modulators, detectors, and in any circuit need to perform a function. In digital circuits, they are used as switches.

What is a Transistor? Types, Uses, Working Principle

In this tutorial, we will learn about the classification and different Types of Transistors. The Transistor became an essential component in modern electronics and we cannot imagine the World without Transistors.

Transistor Symbols

Беккер нахмурился. - У меня только песеты. - Какая разница. Давай сотню песет. Обменные операции явно не относились к числу сильных сторон Двухцветного: сто песет составляли всего восемьдесят семь центов. - Договорились, - сказал Беккер и поставил бутылку на стол.

 Меган, - сказал он печально. - Я полагаю, что у вашей подруги есть и фамилия.

 Вы уверены. - Туризм - моя профессия! - отрезал Клушар.  - Я их сразу узнаю. Он гулял в парке с подружкой.

Они, не замечая Халохота, шли своей дорогой, напоминая черный шуршащий ручеек. С пистолетом в руке он рвался вперед, к тупику. Но Беккера там не оказалось, и он тихо застонал от злости. Беккер, спотыкаясь и кидаясь то вправо, то влево, продирался сквозь толпу. Надо идти за ними, думал .

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 Как ее зовут? - Женщина лукаво подмигнула. - Меган, - сказал он печально.