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The phase difference produced by the active element of Hartley oscillator is __________(a) 0 degree(b) 180 degree(c) 90 degree(d) 120 degreeThis question was posed to me during a job interview.This key question is from Hartley Oscillator-2 in division Oscillators of Analog Circuits

Answer»

The correct answer is (b) 180 degree

Explanation: The COIL has a tap such that the proper PHASE is AVAILABLE to the base of the transistor. Value of L and C are adjusted to give a phase shift of 180°. The transistor itself CREATES a 180° phase shift and hence total shift is 360°/0.



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