Hi, I have to design a MOD 4 ripple UP counter that counts in the sequence 10-11-12-13-10-11-12-13-etc... I believe it is right, although it would be nice if you can check. I won't be able to go to the lab until a few weeks. You can view the schematic here: http://bingweb.binghamton.edu/~ppandey1/untitled.bmp And also, I have another question: The question pretty much says: You have a 5 bit counter. The frequency at the output terminals is what fraction of the input clock frequency? a: 2^0 ... my answer is 1/2 the original clock freq b: 2^1 ... my answer is 1/4 the original clock freq c: 2^2 ... my answer is 1/8 the original clock freq d: 2^3 ... my answer is 1/16 the original clock freq e: 2^4 ... my answer is 1/32 the original clock freq I'm assuming they are using a JK flip flop, and I'm pretty sure that the frequency (Q) of each flipflop after the first is halved each time and it continues throughout. Although, they don't say it's a JK. But I'm assuming you use a JK. Thanks.