Question

For the given circuit, find the time period of the output waveform, given that the diode is used is of Silicon and the supply voltage being applied is ±15V.  The feedback factor is 0.4.

(a) 11.12 ms

(b) 12.4 ms

(c) 11.2 seconds

(d) 5.6 ms

I got this question during an interview for a job.

Query is from Different Types of Multivibrators topic in chapter Multivibrators of Analog Circuits

Answer 1

The correct choice is (a) 11.12 ms

For explanation: T = RCln(1+Vγ/VSat/1-β)

T = 10x2x10^-3xln((1+0.7/15)/0.6) = 20×10^-3ln(1.0467/0.6)=20×0.556×10^-3

T = 11.12 ms.