digital logic - In a JK Binary Counter from 0 to 9, why is the NAND gate connected to the second and fourth J-K flip flop and not the first and fourth? -
4 bit Asynchronous Counter with J K Flip Flop - YouSpice
flipflop - Why use JK Flip Flops in syncronous/asyncronous binary counters rather than D flip flops? - Electrical Engineering Stack Exchange
How to get J/K counter to count from 2 - 9? - Electrical Engineering Stack Exchange
How to design a 3-bit synchronous counter using J-K flip flop that should follow the counting sequence 7, 1 ,4 ,5 ,2 ,3, 0, 6 and repeat - Quora
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
Flip-flop (electronics) - Wikipedia
Lessons In Electric Circuits -- Volume IV (Digital) - Chapter 11
Introduction to JK Flip Flop - The Engineering Projects