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Junction Transistor
Chapter Name : Semiconductor Electronics: Materials, Devices And Simple Circuits
Sub Topic Code : 101_12_14_09_10
Topic Name : Junction Transistor
Sub Topic Name : Transistor As A Device-As A Amplifier
Introduction

A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.

Pre-Requisites:

Transistor

Activity:

Silicon (Si) is the most widely used material in semiconductor devices.

Real Life Question:

What are transistors?

Key Words / FlashCards
Key Words Definitions (pref. in our own words)
Transistor A transistor is a semiconductor device used to amplify and switch electronic signals and electrical power.
Learning aids / Gadgets
Gadgets How it can be used
microprocessors All transistor types can be used as the building blocks of logic gates, which are fundamental in the design of digital circuits. Transistors act as on-off switches; in the MOSFET, for instance, the voltage applied to the gate determines whether the switch is on or off.
Real life uses :

Building circuits.

Places to visit :

Digital circuits.

Practical examples around us
Examples Explainations
Solar Cell Solar cells are typically illuminated with sunlight and are intended to convert the solar energy into electrical energy.
What you learn in Theory:

The common-emitter amplifier is designed so that a small change in voltage (Vin) changes the small current through the base of the transistor; the transistor's current amplification combined with the properties of the circuit mean that small swings in Vin produce large changes in Vout.

What you learn in Practice:

The first discrete transistor audio amplifiers barely supplied a few hundred milliwatts, but power and audio fidelity gradually increased as better transistors became available and amplifier architecture evolved.

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