Analog Electronics
In a transistor amplifier, the reverse saturation electric current ICO

  double for every 10° rise in temperature.
  double for every 1° rise in temperature.
  double for every 5° rise in temperature.
  increase linearly with the temperature.

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Analog Electronics
Optocouplers combine

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

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