Approximate hand solution for beta = 150 and VBE = 0.70 V:
IB ~= (VCC - VBE) / (RB + (beta+1)*RC) ~= 9.58 uA.
IC ~= beta*IB ~= 1.44 mA and VC ~= 5.20 V.
If collector current rises, VC falls. Because RB is fed from the collector, the lower VC reduces base current and opposes the increase. This is DC negative feedback.
Compare this sensitivity with Topic 04 fixed bias and Topic 06 divider + emitter feedback.
