Hello, i'm in my 2nd year of EE. I have done circuit analysis and some basic into to diodes, transistors and op-amps. We have a class in which we are given circuits for a audio amplifier and a power supply. We are required to understand the circuits completely. How they work and why each component is necessary. I am not sure how to approach this. I have learned how to calculate voltages, currents etc. But not design. Is this common in universities? My understanding of semiconductors is weak so i am going over op-amps and diodes again. How can I learn to understand circuits?