Most of us are surrounded by large numbers of electronic devices including television sets, video recorders and computers. The massive increase in electronic devices has resulted from the discovery of materials known as semiconductors. These materials are substances, such as silicon, which can be made to have various conducting properties by the addition of certain impurities. It is these properties which enable modern electronic equipment to be designed and constructed. In this chapter we shall look at some of the tasks electronic devices constructed from semiconductors can perform.
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