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Consider the following circuit and find the time period of the output of the multivibrator.

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Consider the following circuit and find the time period of the output of the multivibrator.

(a) 0.436 ms

(b) 0.436 seconds

(c) .5 ms

(d) 5.22 seconds

I have been asked this question in a national level competition.

This question is from Different Types of Multivibrators in portion Multivibrators of Analog Circuits

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The correct option is (b) 0.436 seconds

The explanation is: Since the two feedback resistors are same, then β=0.5.

Thus time period TO = 2RCln3 = 2x20x10x10^-3x1.09 = 436ms = 0.436 seconds.

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