Analog Electronics
The value of total collector electric current in a CB circuit is

  IC = αIE - ICO.
  IC = βIE.
  IC = αIE + ICO.
  IC = αIE.

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Analog Electronics
Optocouplers combine

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

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