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What distinguishes a Hartley oscillator?

  • A.A crystal replaces the tank circuit entirely
  • B.Three RC sections provide the phase shift
  • C.A tapped inductor supplies the feedback
  • D.A tapped capacitor divider supplies the feedback

Answer: C

A Hartley takes its feedback from a tap on the inductor, so the two inductive sections form the divider that sets the feedback fraction. The capacitive divider is the Colpitts, a crystal is a different family, and RC sections belong to the audio topologies. The whole distinction between Hartley and Colpitts is which reactive element is tapped, and once that is fixed everything else about the two circuits is the same.

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