Integrated Circuits Used 74LS04 Procedure Add IC 74LS04 into ICBase-1 (74LS04).Connect Pin-1 (Input) of ICBase-1 (74LS04) to Input-15.Connect GND Port to Pin-7 (Ground) of ICBase-1 (74LS04).Connect VCC Port to Pin-20 (VCC) of ICBase-1 (74LS04).