Tachometers directly report angular speed. Some are simple processors that merely digest output from an external sensor or encoder; others are integrated units that combine an encoder or sensor and a ...

Constant-speed ac-induction motors don't really hold a constant speed. It's just that their speed varies least from no load to full load of all ac-induction motors. Other induction-motor types don't ...

Sometimes we forget how many things we can do with a simple oscilloscope. In this video [Ben] uses one that Tektronix lent him to measure his DeLorean engine RPM. By checking the car main ~12V voltage ...