piertony Posted November 29, 2005 Report Share Posted November 29, 2005 Hello everyone,I am taking a digital fundementals class at my tech school and I took on a little side project to build a digital clock. I know this has been brought up before, but I need some help making the hours counter. I am only allowed to use 7400 series chips for the clock, specificlly the 7490 chips. So far I cascaded the divide by 10, and 6 chips to produce the seconds and minutes counters. I am stuck on the hours part. Does anyone have a schematic for the hours portion using 7400 series chips? I do have all the logic gates including AND, NAND, OR, NOR, Flip Flops....etc. feel free to email me.Thanks,Tony Quote Link to comment Share on other sites More sharing options...
piertony Posted November 29, 2005 Author Report Share Posted November 29, 2005 Thanks tnk2k,The article on how stuff works helped me out with the minutes and seconds, but I still can't figure out the hours, I know I need some and gates to limit the hours to 12, but I dont know how to work them into the cercuit to from 12 to 1 o'clock-Tony Quote Link to comment Share on other sites More sharing options...
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