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How to calculate RC value for a AC Motor Dimmer

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RohanDey

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Hi,

I want to design a circuit to control speed of an ac motor (eg. a 230V, 100W ceiling fan). I have seen links where they use RC circuit with a diac and a triac to achieve speed control. I just want to know how do I calculate optimum values of R and C for dimmer to work.

Please help!

Thanks..
 

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