Integrated Circuits Used 74LS74 Procedure Add IC 74LS74 into ICBase-1 (74LS74).Connect Input-14 to Pin-1 (Input) of ICBase-1 (74LS74).Connect VCC Port to Pin-20 (VCC) of ICBase-1 (74LS74).Connect VCC Port to Pin-20 (Input & Output) of ICBase-2.