4-bit Binary Up Counter JK Flip-Flop - Multisim Live
Synchronous counter
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
File:4-bit-jk-flip-flop V1.1.svg - Wikipedia
Counters | CircuitVerse
Synchronous counters
Binary Counter
NJIT - COE 394 Digital Systems Laboratory - Experiment No.7: Counters
Digital Electronics Laboratory
Synchronous counter
Virtual Labs
Binary Counter
Synchronous Counter and the 4-bit Synchronous Counter