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Just to dim lights, it could be just a simpler variable resistor or rheostat. This just lowers the voltage and dims the lights. Makes the bulbs last longer, but way reduces their effientcy (sp?) This doesn't work with AC motors though, lowering their voltage will burn 'em up. What you need for these is a Variac. It keeps the voltage constant, but limits the current. This type of circuit is called RC (resistor-capacitor) and uses a variable coil to alter the speed. Like on a ceiling fan or Honda generator that uses a feedback loop dependant upon load. Hope that helps.

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