Consider this circuit:
It's not clear to me what this circuit does. Here's what I think I understand:
- Depending on the position of the pot, the voltage at the non-inverting input is between 9V and 10V
- Because of negative feedback, the voltage at the collector of the transistor is also between 9V and 10V (or is it? It's not clear how the second power supply input is affecting the feedback cycle).
- The current through the load will be at most 10 A (perhaps this is a current source?).
I'm a beginner and these things are very confusing to me. In addition to a theoretical understanding, I'm also interested in how real (ie. non-perfect) op amps might behave differently and the tradeoffs involved in picking the right op amp for this circuit.