Integrated Circuits Used 74LS02 Procedure Add IC 74LS02 into ICBase-3 (74LS02).Connect VCC Port to Pin-7 (Ground) of ICBase-3 (74LS02).Connect Pin-20 (VCC) of ICBase-3 (74LS02) to GND Port.Connect Input-1 to Pin-2 (Input) of ICBase-3 (74LS02).