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motor tachometer
hello has anyone hear built a tachometer for ac motor that works with the touch dro? looking for some idea Ideathanks
The easiest would be to mount disk with some magnets on it (or the spindle) and add a Hall effect sensor or something similar.
I'm assuming you are not talking fixed RPM motor (or you would not need a tachometer). If it's a 3-phase DC, you can do some creative stuff with a clamp-on current probe, but that gets into "I really know my op-amp circuits" territory.
What is your setup, and what are you trying to achieve?

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