conversion AC/DC (220V/ ? (12;8;5;3.3;...))

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mahdi008

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Is there any criteria to make the DC voltage choice in the presence of many supply voltage in the electronic cart?
For example: supply voltage: 12V ; 5V ; 3.3V ; 1.1V ; 1V
For the AC voltage : 220V
So what supply voltage should I choose for the first conversion?
220V/ 12V or 5V or 3.3V ...
 

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