The below circuit has an output 10 times the difference

The below circuit has an output 10 times the difference between the 2 input signals. Show how this could be realised using 2 Operational Amplifiers and 5 Resistors and provide values of the resistorsFor a Proportional plus Derivative Controller construct the shape of the output waveform for the triangular waveform shown if the input rises and falls at the rate of 4 units per minute where Proportional Band is 20% and the Derivative Action time is 0.1 Minutes
For the above graph where the Proportional Only Gain was 4 calculate the required settings of a PID Controller using the Quarter Amplitude Response Method
If for the above the Proportional Only Gain was 6 estimate the settings of a PID Controller using the Ultimate Cycle Method
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