Integrated Circuits Used 74LS27 Procedure Add IC 74LS27 into ICBase-2 (74LS27).Connect VCC Port to Pin-5 (Input) of ICBase-2 (74LS27).Connect GND Port to Pin-17 (Input) of ICBase-2 (74LS27).Connect Output-1 to Pin-7 (Ground) of ICBase-2 (74LS27).