A DC motor-drive system has a comparator. The comparators job is to compare the existing speed of

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A DC motor-drive system has a comparator. The comparator’s job is to compare the existing speed of the motor with the requested speed. The motor speed is transmitted from a tachometer on the outboard shaft of the motor. The requested speed can be from a programmed source, or it can be an analog signal from the application itself. What is the typical component that supplies this signal?

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