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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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Vacuum tube systems in Apollo era space missions
I'm an EE grad but I'm explaining transistors and digital electronic systems to my friend who's not an engineer, but is a bio researcher. …