4 bit Asynchronous Counter with J K Flip Flop - YouSpice
verilog - Synchronous Counter using JK flip-flop not behaves as expected - Stack Overflow
How to fix this JK flip-flop counter? - NI Community
The 4-bit series binary counter using JK-flip-flops. | Download Scientific Diagram
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
4 bits Synchronous Counter with J K Flip Flop - YouSpice