Analog Electronics
The major advantage of a photo transistor as compared to a photo diode is its

 response to higher frequencies.
 durability.
  increased sensitivity.
 AC operation.

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Analog Electronics
Optocouplers combine

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

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