Matek Systems Mini PDB & Linear Regulator 12V - PDB-LDO This PDB is special used on the FPV Quad copter with 3~4S LiPo.   Generally the input voltage of FPV camera is 7~13V,   When 4S LiPo is mounted, the linear regulator can power the 12V camera & 12V LED without ripple & noise.