Hello experts! I have given 2 question in exams. 1)Explain why duty cycle of Astable circuit's output is always greater than 50%? 2)In monostable multivibrator, how low does the triggering voltage have to go in order to initiate the output pulse and why duty cycle must be greater than 70%? What could be the answers to these question. I have given exams. I just want to review my concept. Here are two Astable schematics; One diode in which we get 50% duty cycle. And other without diode. Here is also monostable schematic. Thanks in advance.