I can build and design many different circuits on my own past a certain point, and this is one of the specific topics I have the most trouble in. I have tried to draw up and simulate my own multiple times before, and failed, I really think I have a good idea on what needs to happen to get it to oscillate, I just don't know how to get there cause nothings working, it just seems like the conditions have to be too precise. I'm mainly just focused on square wave oscillators for now though cause it's the most basic I think. Anyways, here's my interpretation of the whole thing: For oscillation to occur, the output has to trigger its input, but with some time delay, otherwise it will not oscillate. So, this cannot happen if the output is exactly in phase with the input and in some cases, it must be ampified with a gain higher than 1??? Is this right, how does it happen?