Integrated Circuits Used 74LS76 Procedure Add IC 74LS76 into ICBase-3 (74LS76).Connect Clock port of 5Hz frequency to Pin-1 (Input) of ICBase-3 (74LS76).Connect Pin-17 (Ground) of ICBase-3 (74LS76) to Pin-6 (Input) of ICBase-3 (74LS76).