Integrated Circuits Used 74LS76 74LS08 Procedure Add IC 74LS76 into ICBase-2 (74LS76).Add IC 74LS76 into ICBase-3 (74LS76).Connect Pin-15 (Input & Output) of ICBase-1 to Output-1.Add IC 74LS08 into ICBase-4 (74LS08).