sir im trying to build the above circuit to regulate the fan speed and its working fine in different steps but there is some humming noise in the fan to reduce this noise, the inductor and capacitor is used
but i dont know how to calculate the inductor and capacitor and how to fix the proper value of this 2 components so that the noise should be completely eliminated.
The dimmer LC filter is implementing a different circuit than previously shown. It can reduce dimmer "buzz" but probably won't eliminate it completely.
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I would choose an EMI suppression choke according to the rated motor current (e.g. 0.5 A or what it is) and maximal available inductance, e.g. a few mH and a capacitor of 0.2 to 1 µF, rated for 250 VAC.
i have chosen this values by studying some of the circuits related to the inductive loads and many of the circuits are using the same value but i didn't understood how they calculated this values
so suggest me some formulas which i can calculate the inductor and capacitor value theoretically which it meets the above values and the inputs are
Vsin = 230/50Hz
Fan resistance = 350 ohms