Solved 2 bit synchronous counter using JK flip-flop Key- | Chegg.com
Ripple Counter - Circuit Diagram, Timing Diagram, and Applications
2 bit counter JK flip flop | Tinkercad
How to design a synchronous counter 4 bit using JK flip flop that can count up even numbers from 0 to 14, and count down odd numbers from 15 to 0 in 1 system - Quora