How to get J/K counter to count from 2 - 9? - Electrical Engineering Stack Exchange
File:4-bit-jk-flip-flop V1.1.svg - Wikipedia
How to implement a 3 bit odd counter with JK flip flops - Quora
Synchronous counter
Week 6 - Program Counter and JKs - BASIS Independent Silicon Valley
4-bit Binary Up Counter JK Flip-Flop - Multisim Live
Synchronous counters
Virtual Labs
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
Digital Electronics Laboratory
Binary Counter
Design a 4-Bit Truncated Sequence Counter (Using JK Flip Flops) - YouTube