This is a slide from one of my semiconductor devices lectures. I understand how the bias circuit works and how to calculate the resistor values however I do not understand how this simplification works.
I see that the capacitors and Vcc source has been removed however I cant understand how the two circuits are equivalent as wouldnt current I1 (from R1) and Ic (from Rc) be different when connected to the AC source?
Thevenin simplification comes to mind but maybe i'm not on the right track!
Any help appreciated.