Integrated Circuits Used 74LS08 Procedure Connect Pin-12 (Input & Output) of ICBase-3 (74LS08) to Pin-14 (Output) of ICBase-3 (74LS08).Add IC 74LS08 into ICBase-3 (74LS08).Connect Pin-5 (Input & Output) of ICBase-4 to Pin-15 (Input & Output) of ICBase-4.