Integrated Circuits Used 74LS08 74LS04 Procedure Add IC 74LS08 into ICBase-1 (74LS08).Add IC 74LS04 into ICBase-2 (74LS04).Connect Pin-1 (Input) of ICBase-2 (74LS04) to Input-15.Connect Pin-1 (Input) of ICBase-1 (74LS08) to Pin-2 (Output) of ICBase-2 (74LS04).