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The '''transistor''' is an "active" component, a device that uses external power to produce an output signal with more power in it than the input signal. A step-up transformer, a "passive" component has voltage gain but no power gain. What distinguishes devices with power gain is their ability to make [[oscillator]]s, by feeding some output signal back into the input. The transistor is the essential ingredient of almost every electronic circuit.<ref>{{Citing TAE|p.61}}</ref>
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== References ==
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* [https://en.wikipedia.org/wiki/Transistor Transistor], Wikipedia
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