ren_zokuken01
New Member
It's just one of those things that you've just assumed to be true whenever I'm playing around with BJTs, but never actually got explicit confirmation from anybody. But, doesn't the formula I_c = hFE x I_b only determines the maximum current that can flow on the collector end? Say in the figure above, the collector current is
(9V - 0.2V)/1k ohm = 8.8mA
and not
(5V - V_be)/1k ohm x 140 = 602mA (assuming hFE = 140)
??
Well is it??
I need this very simple assumption or else I've just plugged-in garbage in my calculation.