modulo 9 down counter

Thread Starter


Joined Apr 19, 2009
Hi all
I got to design a modulo9 down counter (BCD decade counting like 9,8,7,6,5,4,3,2,1,0,9,8,7,6,5,4,3,2,1,0,.....) so I've connected 4 JK-MS fliplops using gates, connected them to th clock, and added gates to detect 0.
So, when i got the state (0000) and have detected this, how do I should put the state 9 (1001) to my counter? using which device, and - how connected to the flipflops?
the cuircuit: