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Inexpensive Variable Speed Control Using a Light Dimmer Switch

This tool uses a modern light dimming switch to provide variable speed control of a motor (fan, pump, etc.) It turns out these dimmers use silicon controlled rectifiers (SCR's) which allow for very nice voltage control, and hence speed control in motors common to farm applications. More on SCR here: https://www.quora.com/What-is-the-difference-between-the-SCR-and-a-voltage-regulator.