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First regenerative circuit was invented and patented in 1914 by

  • A.Johnson Armstrong
  • B.Dr Ferdinand Magellan
  • C.Dr Horace Day
  • D.Edwin Armstrong

Answer: D

Edwin Armstrong invented it.

He patented the regenerative circuit in 1914 while an undergraduate, feeding part of a valve's output back to its input so that the same valve amplified a signal many times over. It made long-distance radio reception possible.

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