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  1. rickp

    Separate or join ac and dc grounds?

    I am working with instruments that have the 120vac mains ground pin tied to the chassis. The 12vdc and 3.3vdc returns are also tied to the chassis. The dc is used for some detectors, solenoid valves, stepper motor, small fan, and logic. So there are some quiet and some noisy dc devices. In...

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