Hi, I've been learning about transistors lately through the Horowitz & Hill book. I'm surprised to see that when used as a current source the collector voltage only changes with load voltage with an ideal transistor. When I say I'm surprised I mean that in non-ideal models the base current seems to vary with changes in collector voltage/current. I believe this is related to something called the Early Effect and changes in hfe caused by collector voltage change. So my question is how can collector voltage affect base current? I thought base current dominated everything and set the emitter current, therefore I thought it would be totally independant of Vc and Ic. Would I be right in thinking of a transistor used as a current source as a 'current-stifler' from the collector's perspective? In the respect that regardless (assuming non-saturation) of Vc's magnitude the current stays set, and in a real model this doesn't quite hold true? Is it possible to bugger a transistor by setting the current too low and collector voltage too high? This is probably the most interesting thing I've discovered since I was a young child. I had no idea electronics was so absorbing!