I am having trouble constructing a circuit on the NI ELVIS breadboard. In the attachments are the circuit diagrams and the result I should be getting, the first picture is the one I constructed. I think my main problem is the rheostat, I don't know how to connect it. I tried looking on google but there seems to be no such rheostats like the one I am given. Look at the pictures, it's the blue one and it has a spinning thing going on (turning it clockwise will increase it's resistance). I am supposed to construct the circuit as shown in the diagram and first set the rheostat to 50%, the output wave should look like a sine wave. Next I have to set the rhoestat to 70% and I should get a square-like wave. The waves I should be getting are in the pictures.