> How to calculate capacitor's value that function as a current limiter?

About 70mA per uF @ 230V using Xc = 1/(6fC) or Irms = Vs / Xc

so in your case 0.47uF or 0.56uF would pass a little over 30mA

http://home.clear.net.nz/pages/joecolquitt/txless.html

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