[Problem w/ j/k flip flops?]

I got it working, Thanks for all your help, I used the 7404 because the outputs of the 74154 are inverted. anyway I think I got it......?
thanks again ;D

[Problem w/ j/k flip flops?]

Thank you , I have new ic's. what would a 5.1V zener do if i put it series with the battery?
I took a look At the How stuff works and they tied the set/clear to high. I tried it and it worked !. I have all 4 bits counting.this is what I would like to do. can the 7404 drive one or two LED's. Also could you please explain what you meant by current limiting resistors. are they needed to protect the LED or The output of my IC, and how is the size calculated.

Thanks for all your help

[Problem w/ j/k flip flops?]

My goal is to use the counter through a 4-16 decoder to drive 16 led's in sequence at around 5-7Hz. I cannot seem to figure it out anyone who knows how to do this, I really could use your help.

Thanks :-\

[Problem w/ j/k flip flops?]

I built a circuit with a 555timer driving a 4-bit syncronous counter.
after I constructed the first two bits using an ls7476 it worket fine. When I added the 3rd and 4th bits the 1st two bits would not register on my logic probe but the 3rd and 4th did. If anyone has some insight it would be greatly welcomed.

Thank you