Integrated Circuits Used 74LS02 Procedure Add IC 74LS02 into ICBase-3 (74LS02).Connect GND Port to Pin-7 (Ground) of ICBase-3 (74LS02).Connect Pin-20 (VCC) of ICBase-3 (74LS02) to VCC Port.Connect Pin-1 (Output) of ICBase-3 (74LS02) to Output-1.