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Message: <blockquote data-quote="laal" data-source="post: 8424726" data-attributes="member: 94459">TransistorA transistor is a semiconductor<a href="http://draft.blogger.com/goog_1075729140" target="_blank"> </a>device  used to amplify and switch electronic signals. It is made of a solid  piece of semiconductor material, with at least three terminals for  connection to an external circuit. <img src="http://lh5.ggpht.com/_8JZhVVmpICU/S8AZ1ZmjWTI/AAAAAAAAAJw/wdnlApAq6ec/SMT%20TRANSISTOR.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> A voltage or current applied to one pair of the transistor's terminals  changes the current flowing through another pair of terminals. Because  the controlled (output) power can be much more than the controlling  (input) power, the transistor provides amplification of a signal. Some  transistors are packaged individually but many more are found embedded  in integrated circuits.The transistor is the fundamental building block of modern electronic  devices, and its presence is ubiquitous in modern electronic systems. Types of transistor <img src="http://www.kpsec.freeuk.com/images/transbce.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" />  Transistor circuit symbols There are two types of standard transistors, NPN and PNP,  with different circuit symbols. The letters refer to the layers of  semiconductor material used to make the transistor. Most transistors  used today are NPN because this is the easiest type to make from silicon. This page is mostly about NPN transistors and if you are new to electronics it is best to start by learning how to use these first. The leads are labelled base (B), collector (C) and emitter (E).The leads are labelled base (B), collector (C) and emitter (E).These terms refer to the internal operation of a transistor but they are  not much help in understanding how a transistor is used, so just treat  them as labels!</blockquote>

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