1. Design a single OP AMP amplifier with a voltage gain of -1000 and an input resistance greater than 5 kΩ using standard 5% resistance values less than 3:3 MΩ.
2. Design an OP AMP amplifier with a voltage gain of 4 using only 15-kΩ resistors and one OP AMP.
3. Using a single OP AMP, design a circuit with inputs v1 and v2 and an output vO = v2 - 5v1. The input resistance seen by each input should be greater than 1 kΩ.