Analog Electronics
A 741 C has

  an output impedance of 75 Ω.
  an input impedance of 2 MΩ.
  a voltage gain of 100,000.
All of these

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Analog Electronics
Optocouplers combine

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

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