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An rc or hobby servo is a closed-loop servomechanism, typically used in radio control model, hobby or small-scale robotics applications. It usually consists of a motor coupled to a sensor (e.g. potentiometer) for position feedback, typically using a high ratio gearbox.

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How can I power a wheel but let it spin freely when not under power?

You can use a magnetic clutch. When the strain on the horn passes a particular mark, it overpowers the pairs of magnets holding the clutch plates causing it to slip without damaging the gears. You can …
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