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  _____     ______               ___      _____   
 / ____||  /_   _//   ____      / _ \\   / ____|| 
/ //---`'   -| ||-   |    \\   | / \ || / //---`' 
\ \\___     _| ||_   | [] ||   | \_/ || \ \\___   
 \_____||  /_____//  |  __//    \___//   \_____|| 
  `----`   `-----`   |_|`-`     `---`     `----`  
                     `-`

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發送短信 : Deign and build step-down switching regulator