Integrated Circuits Used 74LS03 Description home Procedure Add IC 74LS03 into ICBase-1 (74LS03).Connect VCC Port to Pin-20 (VCC) of ICBase-1 (74LS03).Connect Input-15 to Pin-19 (Input) of ICBase-1 (74LS03).Connect VCC Port to ICBase-1 (74LS03).