48 questions linked to/from Why is Vbc absent from bjt equations?
4k views

### Why is a BJT considered “current-controlled”?

With BJTs, we can control base current using Vin (from diagram). Why do textbooks state that BJTs are current controlled when it's obvious that changing the voltage controls the current through the ...
4k views

### Can this transistor (2N2222) take 6 V on emitter-base? Am I reading the datasheet incorrectly?

I have created the following circuit to better understand how to use a transistor as a switch*. I've been struggling with understanding datasheets for transistors. simulate this circuit – ...
2k views

### Terminology for BJT “regions of operation”

How regions (modes) of operation are defined and correctly named? The most controversial thing is the so named “saturated region/mode”. It is defined differently, sometimes radically different, in ...
4k views

### A confusion about the formula for transistor Vbe Ic characterisitcs

Below is NPN BJT transistor Vbe Ic characteristics and the formula: Many texts approximate this equation as: Ic = Is*e^(Vbe/Ut) and following this they say when Vbe=0, Ic becomes equal to Is. ...
6k views

### How does the current travel in Bipolar Junction Transistor (BJT)?

I am completely unable to understand the current direction in npn transistor. in figure 1, the red arrow indicates the electron flow(which is from emitter terminal to collector terminal). thus ...
895 views

### Differential and Multistage Amplifiers(BJT)

I want to determine the currents in each of the branches. I could analyse the current mirror portion and the differential amplifier portion, but facing problem thereafter. I could find the ...
762 views

### Input stage of a current mirror circuit

I'm trying to understand current mirror circuits and I've been reading this article. I'm unable to understand the input part of the circuit where the author says "Producing the opposite where the ...