Analog Electronics
An emitter follower has a voltage gain that is

  approximately equal to one.
 zero.
 much less than one.
 greater than one.

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Analog Electronics
Optocouplers combine

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

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