The best learning is Doing it. Imagine you can use your life is better with your own electronic project. And at the same time, you learn digital basics, flip-flop switch circuit. Using CD4027 JK flip-flip. It’s great, right? Let’s get started to see the two circuits.
Simple Key code lock switch circuit using IC-4017 digital, uses 10 switch bottom to control output by Relay. No microcontroller so easier and cheaper!
It may be difficult. In the design of the BCD signal generator circuit by pressing a key. Here is how you make a keyboard encoder circuit for 16 keypads.