sorry can't type in arabic
1- the RC time constant must be less than the periodic time of the wave at least 1 tenth of the peridic time
2- the maximum voltage drop on the resistor witch will leads to the maximum current through it mustn't exceed the power rating of the resistor & it shoud be in a reasonable amount
I'm sory I don't have a certain value for them, It will take some effort from you.
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