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 Applications
2-bit asynchronous up counter | Tinkercad
Counters | CircuitVerse
flipflop - 2 Bit Synchronous circuit that operates only with clock [Q] - Electrical Engineering Stack Exchange
Bidirectional Counter - Up Down Binary Counter
Synchronous Counter Design - Online Digital Electronics Course