Analog Electronics
For audio frequency applications, the popular oscillator used is

 Wien bridge oscillator
 Hartley oscillator
 Phase shift oscillator
 Crystal oscillator

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Analog Electronics
Conventional biasing of a BJT has

  EB forward biased and CB forward biased.
  EB reversed biased and CB forward biased.
  EB forward biased and CB reversed biased.
  EB reversed biased and CB reversed biased.

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