Hi guys, I made an app for my students in order to help them understand different BJT circuits. Basically the app allows you to select from three biasing circuits:

Fixed Bias


Fixed Bias With Emitter Resistor


Voltage Divider Bias


You can then vary different values in the circuit by moving sliders up and down. You can vary:

Resistor values
Power Supply Voltage
Transistor Gain

The app will then plot in real time the Q-point and calculate Ib, Ic, Vce, Icsat, Vceco. It also calculates Vb and Ve for the voltage divider circuit.

You can check out the page on brads projects here:
http://www.bradsprojects.com/electronics/Bradsprojects-BJTBiasing.html

The app should be approved by apple within the next week or so.