Lab #7: Operational Amplifiers Learning Objectives: After completing this lab, students should Understand the usage of a dual-voltage power supply. Understand the practical limitations of operational amplifier circuits. Be able to analyze, build, and test a simple operational amplifier circuit. This lab also reinforces students' understanding of how to use a POT to produce an adjustable voltage in a circuit. 1 Dual-voltage supply All the circuits in earlier labs require only a single voltage supply. Circuits in this lab require a dual-voltage supply. Figure 1A shows a 5v dual-voltage supply where there are two 5v voltage sources connected in series. The voltage VAB and VBC are both 5v and VAC is 10v. In such circuits, node 'B' is often designated as the reference ground node as labeled in Figure 1B. In this case, VA is 5 and VB is -5v with respect to the reference ground node 'B' or just simply 'ground'. Circuits requiring dual-voltage have three power line connections: a line for the positive voltage, one for the negative, and one for the 0v (or ground) connectio