soft start

Hello, Can anyone explain to how this circuit work? ( i got the picture from youtube but i didnt understood the explanation.. also searched on the internet and only found little information) I want to know how to select the correct resistors, caps to result to certain delay/rise_time. Thank you

Hi everyone, I want to develop a soft start system for the receiver. In real system, it is a power supply in the laboratory with a variable resistance value - hence programming the resistance R3 as a variable value determined by the voltage source. The system to perform a soft start for the...