LDO regulator sya master,, common name designator nyan ay 1117,depende na lang yung kasunod na number kung anung voltage sya, example 1117-1.8V,1117-3.3V,1117-ADJ which is adjustable. Kung mapapansin nyo po dun sa board mismo yung pin 1 ya naka-connect sa ground which is tama pag tiningnan mo sa...