I am building a digital clock using 7490s for the minutes and seconds, but I have to use a 74192, 2 jk flip flops, and 2 3-input NAND gates for the hours and am/pm indicator. Can't figure out how to hook it up. I have the minutes and seconds circuits done and working, just stuck on the hours. All I have are multisim files for schematics, will post as soon as I figure out how.