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A transistor is a semiconductor device that can amplify signals and switch power. The types that are used most are BJT (Bipolar Junction Transistor), UJT (Unijunction Transistor), and MOSFET (FET, for Field Effect Transistor).

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Applets illustrating the operation of diodes and transistors

Anyone know a site with interactive applets illustrating the operation of diodes and transistors as well? …
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