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step downing and AC to DC supply voltage

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elecaau

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i am new for designing please somebody help me.
i want to step down the voltage from supply (220v -250v rms) to the voltage that gives rectified voltage less than 5v so that i can connect to Arduino. here is my circuit. Am i correct ? is there another option that is cost effective?

upload_2017-3-3_9-11-59.png
 

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