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Transistors

  • They are unidirectional current carrying devices with capability to

control the current flowing through them

  • The switch current can be controlled by either current or voltage

  • Bipolar Junction Transistors (BJT) control current by current

  • Field Effect Transistors (FET) control current by voltage

  • They can be used either as switches or as amplifiers

1

NPN Bipolar Junction Transistor

  • One N-P (Base Collector) diode one P-N (Base Emitter) diode

2

1

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