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Find the approximate frequency of output waveform of a monostable multivibrator given that RC = 20×10^-3 and feedback factor = 0.3.

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Find the approximate frequency of output waveform of a monostable multivibrator given that RC = 20×10^-3 and feedback factor = 0.3.

(a) 200Hz

(b) 142Hz

(c) 233Hz

(d) Can’t be found out without supply voltage value

This question was addressed to me in final exam.

The origin of the question is Different Types of Multivibrators topic in chapter Multivibrators of Analog Circuits

1 Answer

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Best answer
Right choice is (b) 142Hz

The best explanation: T = RCln(1/1-β)

T = 20×10^-3 x ln(1/0.7) = 20×0.35×10^-3 = 7ms

f = 0.142 kHz = 142 Hz.

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