Integrated Circuits Used 74LS03 Procedure Add IC 74LS03 into ICBase-2 (74LS03).Connect Pin-20 (VCC) of ICBase-2 (74LS03) to VCC Port.Connect Output-0 to Pin-3 (Output) of ICBase-2 (74LS03).Connect Input-0 to Pin-1 (Input) of ICBase-2 (74LS03).