Integrated Circuits Used 74LS03 74LS02 Procedure Add IC 74LS03 into ICBase-1 (74LS03).Add IC 74LS02 into ICBase-2 (74LS02).Connect Pin-20 (VCC) of ICBase-2 (74LS02) to VCC Port.Connect GND Port to Pin-7 (Ground) of ICBase-2 (74LS02).