In message <kt9dt1+fgsc@...>, dated Tue, 30 Jul 2013, sawreyrw <sawreyrw@...> writes:
The equation Helmut gave is an excellent approximation for the relationship between Vbe and Ib. It is used in ever circuit with a BJT that anyone simulates; in other words, it is a fundamentally important relationship in BJT analysis.
Of course; didn't I write: 'The base current is exponentially dependent on the base voltage and the junction temperature.'
As I tried to explain, you don't ever apply a DC voltage directly between base and emitter because in practice the base current (and emitter current) is unpredictable due to its extreme dependence on voltage and temperature, and which transistor you took out of the box.
--
OOO - Own Opinions Only. With best wishes. See www.jmwa.demon.co.uk
Why is the stapler always empty just when you want it?
John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK
