Analog Electronics
For transistor action

  Je must be forward biased and Jc should be reverse biased.
  the base region must be very thin and lightly doped.
  the emitter should be heavily doped.
  all of these.

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Analog Electronics
Optocouplers combine

 Power transistor and silicon transistor.
 SITs and BJTs.
 IGBTs and MOSFETs.
  Infrared light emitting diode and a silicon photo transistor.

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