Integrated Circuits Used 74LS74 Procedure Add IC 74LS74 into ICBase-1 (74LS74).Connect GND Port to Pin-7 (Ground) of ICBase-1 (74LS74).Connect VCC Port to Pin-20 (VCC) of ICBase-1 (74LS74).Connect GND Port to Pin-7 (Input & Output) of ICBase-2.