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Define transistor and its types9/6/2023 ![]() ![]() This consisted of a thin wire placed onto one of a number of types of material. Soon afterwards the Cat's Whisker detector was discovered. Thermionic valve or vacuum tube technology was introduced in 1904, but these devices were expensive, and also required powering by a battery. Various ideas were being investigated as detectors. The first semiconductor effects were noticed back in the early 1900s when the first wireless or radio sets were being used. Semiconductor technology is now well established but it has been used for over a hundred years. Plastic leaded transistor selection Transistor development Together with their field effect transistor, FET, relatives which use a very different principle, the bipolar transistor forms the basis of most of todays electronic equipment, either as discrete devices or within integrated circuits. Most digital ICs use field effect technology, but many analogue ICs use bipolar technology to provide the required performance. But transistors are also widely used within integrated circuits. There is the basic transistor in a leaded form or its available as a surface mount transistor. ![]() Today, bipolar transistors are available in many forms. All these and many more everyday items have all been made possible by the invention of the transistor. The introduction of the bipolar transistor has enabled many technologies we take for granted today: everything from portable transistor radios, through to mobile phones, and computers, remote operation, the functionality we take for granted in current day automobiles, etc. The development of the bipolar transistor or bipolar junction transistor, BJT, has resulted in many changes to the world. Transistors are at the very core of today's electronics technology. Transistor basics Gain: Hfe, hfe & Beta Transistor specifications Transistor and diode numbering codes Choosing replacement transistors What is a Transistor: How Does It Work - NPN & PNP Description about what a transistor is, how a bipolar transistor works, and details of NPN and PNP transistors. ![]()
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