Integrated Circuits Used 74LS08 74LS04 Procedure Connect Pin-4 (Input) of ICBase-1 (74LS08) to Pin-5 (Input) of ICBase-1 (74LS08).Add IC 74LS08 into ICBase-1 (74LS08).Add IC 74LS04 into ICBase-4 (74LS04).Add IC 74LS04 into ICBase-2 (74LS04).