Analog Electronics
The following are the necessary requirements of an oscillator

 Frequency stability
 Both A and B
 Amplitude stability
 Power stability

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Analog Electronics
The ICBO is the electric current that flows when some DC voltage is applied

  in the forward direction to the collector junction with emitter open.
  in the forward direction to the emitter junction with collector open.
  in the reverse direction to the emitter junction with collector open.
  in the reverse direction to the collector junction with emitter open.

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