Integrated Circuits Used 74LS03 Procedure Add IC 74LS03 into ICBase-2 (74LS03).Connect Input-8 to Pin-1 (Input) of ICBase-2 (74LS03).Connect Pin-2 (Input) of ICBase-2 (74LS03) to Input-7.Connect GND Port to Pin-20 (VCC) of ICBase-2 (74LS03).