Integrated Circuits Used 74LS151 74LS04 Procedure Add IC 74LS151 into ICBase-1 (74LS151).Connect VCC Port to Pin-20 (VCC) of ICBase-1 (74LS151).Connect GND Port to Pin-8 (Ground) of ICBase-1 (74LS151).Add IC 74LS04 into ICBase-2 (74LS04).