One Button On-Off circuit using 4017 IC. Hi folks today I am going to discuss about One Button On-Off circuit by using 4017 counter IC. Description of IC 4017B: The 4017B is a monolithic IC fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages (I am using DIP package) . This is 5-stage Johnson counter having 10 decoded outputs (Q0 – Q9). Read More...