i see you have evaded the question in my last post. i worded it in such a way that google isn't going to be much help unless you know a little about what you are looking for. which one? like i said before, there are 3 basic amplifier configurations. can you name at one of them? name, as in what it's called in the field. yes, there are 2 types of BJT, one works with positive supplies the other works with negative. current in both types flows from negative to positive. i know of no transistor amplifier circuit that operates with an open base. post the schematic of such an amplifier. okay, i'm done with you. i directly challenge you to post a schematic with the transistor in normal conduction with a Vbe of 5 volts.