Integrated Circuits Used 74LS04 Procedure Add IC 74LS04 into ICBase-1 (74LS04).Connect Pin-1 (Input) of ICBase-1 (74LS04) to GND Port.Connect Pin-2 (Output) of ICBase-1 (74LS04) to VCC Port.Connect Pin-19 (Input) of ICBase-1 (74LS04) to VCC Port.