I'm studying for EE final exam
First Question: what is the current through the red LED?I have been working on this problem. So far, what i got is that with 5V come in the non inverting input of the op amp so that the inverting should be at 5V, also. From that point, i can found the emitter current which equal to (5V-0V)/160.
Second question: What is the purpose of the BJT?I am not sure what is the purpose of the BJT on this problem? is it acting like a switch or a buffer?
