Integrated Circuits Used 74LS03 Procedure Add IC 74LS03 into ICBase-1 (74LS03).Connect Pin-16 (Input) of ICBase-1 (74LS03) to GND Port.Connect Pin-19 (Input) of ICBase-1 (74LS03) to VCC Port.Connect Pin-7 (Ground) of ICBase-1 (74LS03) to Output-14.