j-k flip flop

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jepoy12

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I have a bit knowledge on how j-k flip flop works and were currently discussing it on my school but I still dont get this one.
how does the counting goes back to zero"0" when it hits to "9"?
can some help me explain this one. ( :
 

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I have a bit knowledge on how j-k flip flop works and were currently discussing it on my school but I still dont get this one.
how does the counting goes back to zero"0" when it hits to "9"?
can some help me explain this one. ( :

hi,
Look where pins 4 and 5 are connected on the 7408 AND gate.

EDIT:
This diagram will help.
 

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On your circuit diagram, you should have the outputs labeled A, B, C, D, not D, C, B, A to be consistent with the way that the they are normally labeled, such as here:-

74LS90 Datasheet

Also, don't bother with the power and ground lines on a logic diagram.
 
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