Analog Electronics
Which of the following statements is false?

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

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Analog Electronics
The typical input stage of an opamp has a

  differential input and single - ended output.
  differential input and differential output.
  single - ended input and differential output.
  single - ended input and single-ended output.

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