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Which oscillator needs a gain of twenty-nine?

  • A.The Wien bridge, whose network attenuates by three
  • B.The Colpitts, whose fraction is set by two capacitors
  • C.The Hartley
  • D.The three-section phase shift type

Answer: D

The three-section phase shift network attenuates by twenty-nine at the frequency where it gives a hundred and eighty degrees, so the amplifier must make that up. The Wien bridge needs only three, and the LC types' requirements depend on the divider ratio chosen. A gain requirement is always the reciprocal of the network's transmission at the oscillation frequency, which is why it can be computed rather than looked up.

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