On 19/06/2011 16:57, V G wrote: >> > The transistor saturates and Vce become more-or-less constant, decrea= sing >> > slowly with decreasing collector current, given the constant base cur= rent. >> > That's what's happening. >> > > Thanks. Now I understand the Vce saturation. I didn't realize it was ther= e > before. > > You were told several times. At "saturation" a BJT looks like a constant voltage. Nothing like a=20 resistor. At "saturation" an Enhancement FET is a bit like a voltage controlled=20 resistor. (VGS sets resistance). If not saturated then a depletion jFET or BJT is a little like a=20 constant current source. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .