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Learn electronics using tutorials for beginners. Learn how to design electronic circuits and how to use electronic parts .

Bipolar transistor

One family of transistors is known as bipolar transistor(bipolar junction transistors BJTs) of which there are two basic types called NPN and PNP. These names relate to the way in which the silicon is doped .
A bipolar transistor is comprised of base, emitter, and collector and is a current-controlled
device with a low input impedance.
The first transistor was invented at Bell Laboratories in 1947 by Nobel-Prize physicists John Bardeen, William Shockley, and Walter Wratain.

Circuit Diagram: 
Bipolar transistor circuit diagram
Bipolar transistor symbol

Types of electrical transformers used in electronic circuits

Because of high variety of types of electrical transformer used in electronic circuits we describe bellow in this article most used electrical transformer types.

What are semiconductors

Resistors, capacitors and inductors are known as passive components . Electronic components which produces changes in circuit conditions by reacting to applied signals are known as active components . The majority of active components used in electronic circuits use semiconductors .
A semiconductor can sometimes act like a conductor, and at other times like an insulator in the same circuit.
The term semiconductors arises from the ability of these materials to conduct “part


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