Analog Electronics
Most small - signal E - MOSFETs are found in

  heavy - current applications.
  disk drives.
  integrated circuit.
  discrete circuits.

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Analog Electronics
Optocouplers combine

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

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