I am trying to understand the exact working of this circuit, I have been told that this circuit provides a duty cycle of 50% from my previous questions, the same which I successfully verified in LTSpice simulation also, but when I built the exact circuit on a breadboard and observed the waveform on a CRO, I got the following which is clearly not 50%.
I have used the exact same value of components except for R4 which is variable. Can someone tell me what the mistake is as to why I am not able to obtain a 50% duty cycle? My ultimate objective is note down the corresponding frequencies for different values of R4, but I am confused whether to consider the ON time or OFF time for my application since both are different now? Apologies if the time scale data of the CRO isn't clear.