Hello! I've got this project due for a college course, and the teacher has reviewed my work and said that it is within specification, but he asked me to compute the gain the good old fashioned way with pen and paper and to submit this proof together with my simulations. I tried researching around but I fear that I am not quite up to the task.
The circuit is a series voltage regulator with temperature(t8, t7) and over-current protection(t9), the amplifier is there to provide negative feedback (through p1, r5, t4)against voltage fluctuations and the like. Input voltage would be 40V, output 20V (DC).
I have also started by computing the bias point on paper so as to make sure that all my components would be within the power dissipation or current specifications. It's just that I don't really understand how I would compute the exact gain for the amplifier.