Question

How can the duty cycle be changed for an astable multivibrator?

(a) By adding another capacitor to the circuit

(b) By adding diodes to the circuit

(c) By adding an inductor to the circuit

(d) The duty cycle cannot be changed

I have been asked this question in my homework.

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

Answer 1

Correct choice is (b) By adding diodes to the circuit

The best I can explain: To generate a square wave of duty cycle other than 50%, diodes can be connected so that charging and discharging now occurs through these diodes. This thus changes the time period as well as the duty cycle of the diodes.