Transistors





Transistor was invented in 1948 by John Bardeen, Willium Bradford Shockley, and Walter Houser Brattain of Bell Telephone Laboratories, U.S.A. The term transistor was coined by John R. Pierce, bell Labs engineers.

The transistor is a solid state semi-conductor device which can be used for amplification, switching, voltage stabilization, signal modulation and many other functions. A transistor transfers a signal from a low resistance to high resistance.

The prefix Trans means the signal transfer property of the device while istor classifies it as a solid element in the same general family with resistors. It has now become the heart of most electronic applications. It is a minute electronic switch. They are building block of the processor which is the brain of computer. Its functionality is based on on/ off (0/ 1) which represents binary numbers.

It contains two junction formed by sandwiching either p-type or n-type semiconductor between a pair of opposite types.

There are two types of transistors:

1. n-p-n Transistor

2. p-n-p Transistor

Transistor symbol

Transistor symbol



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