Integrated Circuits Used 74LS04 74LS08 74LS132 Procedure Add IC 74LS04 into ICBase-1 (74LS04).Connect Pin-7 (Ground) of ICBase-2 (74LS08) to Pin-8 (Input & Output) of ICBase-1 (74LS04).Add IC 74LS08 into ICBase-2 (74LS08).Add IC 74LS132 into ICBase-3 (74LS132).