Integrated Circuits Used 74LS74 74LS08 Procedure Add IC 74LS74 into ICBase-3 (74LS74).Add IC 74LS74 into ICBase-4 (74LS74).Add IC 74LS08 into ICBase-5 (74LS08).Connect Pin-2 (Input & Output) of ICBase-1 to Input-15.