Op amp Definition and 305 Threads

What is the difference between a current source using an op amp and one using a single transistor? Why would you use one over the other, etc? Thanks!

gain of the circuit is -50 V/V, open loop gain is 200 V/V. There are three resistors in the circuit. The standard R2 and R2 and there is an R3 resistor. Vo is across R3. It is connected to the output of the output going to ground. I need to find a value for R1 to make the gains works. The value...

Hi, I have a problem I am trying to work out on simple Op Amps gain, and I am having trouble trying to prove what the gain is. I know what the gain is supposed to be (see below), but I am stumped as to how to actually go about proving it. When I try to setup the Kirchoff node equations I get...

I have to solve an op amp circuit for a lab I'm doing but the circuit they have given me looks confusing (it's on page 46, http://filebox.vt.edu/users/oshekari/Manual_Student.pdf). Why does the 4.7k ohm resistor have an arrow pointing to the middle of the 100 ohm resistor? I know the 100ohm is a...

Hi. I've always seen inverting amplifiers with the input going to the negative terminal of the op amp, and noninverting amplifiers with the input going to the positive terminal. However I don't see any reason why the inverting amplifier couldn't be used exactly the same way with the input going...