Integrated Circuits Used 74LS153 74LS04 Procedure Add IC 74LS153 into ICBase-1 (74LS153).Connect GND Port to Pin-1 (Input) of ICBase-1 (74LS153).Connect Input-1 to Pin-2 (Input) of ICBase-1 (74LS153).Add IC 74LS04 into ICBase-2 (74LS04).