Integrated Circuits Used 74LS04 Procedure Add IC 74LS04 into ICBase-1 (74LS04).Connect Input-14 to Pin-1 (Input) of ICBase-1 (74LS04).Connect Output-14 to Pin-2 (Output) of ICBase-1 (74LS04).Connect Input-13 to Pin-3 (Input) of ICBase-1 (74LS04).