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The two types of transistors (a bipolar transistor and a field-effect transistor) have slight differences in how they are used in the circuit. A bipolar transistor has terminals (labelled bases), a collector and an emitter. A small current at base terminal can control or switch a much larger current between the collector and emitter terminals. For a field-effect transistor, the terminals are labelled gates, sources, and drains, and the voltage at the gate can control the current between the source and the drain.
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