EECE 251 - BJT AC load line vs. DC load line.

This is a "temporary" video. Its soundtrack reminds me of talking through one of those child's paper-cup-string-paper-cup telephone. I will remove it after our quiz of tonight's. Only UBC/ECE have access to this temporary video. This is the fourth (d) example in the "silent" video, the last one.

[@rolinychupetin]

Oh, my! I had forgotten that I uploaded this "raw" footage with all the "cuts" and "takes", etc., etc.At some point, I will find the time to finish it.

[@818de60]

Great video, very useful example

[@toituhoc5395]

thanks you very much!

[@ali64fahad]

thank you v.much

[@G8tr1522]

Could anyone explain why he chose the second, smaller AC load line (the second blue one)? I get why there is the first one, but I don't understand the choice of the second one at all. Why wouldn't you try to optimize the q-point of the first blue line? Why is the second one better? Thanks!

[@stefanopassiglia]

I know the question is very old, but I'll answer it anyway. I you moved the Q-point of the first blue line so that the AC Q-point sits between the cutoff and the saturation currents, it would move away from the DC load line which cannot happen as that represent the bias point of the transistor. The second one is the only one possible as its (AC) Q-point sits on the DC load line.

[@ali64fahad]

excellent but pls note that R2=0.75kohms to have the current=5micro A. thanx