Analog Electronics
The input stage of an op amp is usually a

  class B push-pull amplifier.
  CE amplifier.
  differential amp.
  swamped amplifier.

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Analog Electronics
Which of the following statements is false?

A push pull output transformer has a centre-tapped primary
Push pull signals are equal and opposite in phase
Class AB operation cannot be used for a push pull audio power output phase
All of these

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