Procedure
- Connect Pin-1 (Input & Output) of ICBase-2 to Input-10.
- Connect Pin-2 (Input & Output) of ICBase-2 to Input-9.
- Connect Pin-1 (Input & Output) of ICBase-3 to Pin-3 (Input & Output) of ICBase-2.
- Connect Pin-20 (Input & Output) of ICBase-3 to Pin-20 (Input & Output) of ICBase-2.