For my last design question, Transistor current control with collector feedback, I want to add a NPN transistor between OpAmp and already shown transistor in common emitter mode. With new design, the base of output transistor (already included) will be driven by newly added NPN transistor as collector load.
My question is: To design the values of RE and RC of newly added transistor, which factors do I need to consider ?
What I already know is only that the total resistance of new Transistor should be adjusted such that it's base current Ib does not exceed the output current limit of OpAmp----- Ic = 15 / R and Ib = Ic / hFE
Now how do I adjust this calculated current limiting resistance R between Collector and Emitter of a new transistor. As far as I know, Emitter Resistance is also feedback to input voltage.
The circuit operates in linear mode.
Thanks in Anticipation for your time and opinion.