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Home Dimmer Switch Hums
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diyguy427
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Join Date:
Aug 2010
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#1
Home Dimmer Switch Hums
08-04-2010, 12:10 PM
Light switch is a dual control; fan and light. When just the fan is on there is no noise from the switch. When the light is on it hums. Why?
HayZee518
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Jul 2004
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#2
08-04-2010, 12:59 PM
the light control uses what is called a diac. it adjusts the voltage to produce a chopped ac waveform which dims the lights -
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