Design BCD (MOD-10) Ripple Counter using JK Flip-Flop || Sequential Logic Circuits - YouTube
Ring and Johnson Counters - EEES.IN
How to design an asynchronous counter using JK flip for getting the following sequence 0-2-4-7-9-0 - Quora
Design a 4-Bit Truncated Sequence Counter (Using JK Flip Flops) - YouTube
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
Synchronous Counter and the 4-bit Synchronous Counter