3.3V or 5V Switches [hlp]

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elec350

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hello
i want to use switch, but some of switches use +5V for ctrl. but my digital board gives 3.3v. how i can compatible them with each other? is there any level converter?
 

there are switches which use +3V for positive control (e.g., Hittite). Can you use those?
 

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    elec350

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