Analog Electronics
The common-source JFET amplifier has

  a high input impedance and a very high voltage gain.
  a high input impedance and a voltage gain less than 1.
  a very high input impedance and a relatively low voltage
  no voltage gain.

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Analog Electronics
Optocouplers combine

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

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