Integrated Circuits Used 74LS90 74LS04 74LS08 Procedure Add IC 74LS90 into ICBase-1 (74LS90).Add IC 74LS04 into ICBase-4 (74LS04).Add IC 74LS08 into ICBase-5 (74LS08).Connect Clock port of 1Hz frequency to Pin-20 (Input) of ICBase-1 (74LS90).
