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I am trying to regulate speed of 220V ceiling fan from Arduino but unable to handle the reverse voltage and current though I am applying the flyback diode across inductive load.this is the circuit i have been testing, the circuit with resistive load is working fine in dimming but the inductive one is not working.

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A freewheel diode will end in tears because your circuit is AC .The accepted approach is to place a RC snubber across the noisey triac .

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