Analog Electronics
A zener diode

  has a constant voltage in the breakdown region.
  is forward biased.
  has a barrier potential of 1 V.
  is a battery.

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Analog Electronics
Optocouplers combine

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

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