electronic noob Posted January 6, 2005 Report Share Posted January 6, 2005 need help designing a stop watch (mod 60 counter).using ICs:1 - 74LS74 (D-type flip flop)2 - 74LS93 (4-bit binary counter)1 - 74LS32 (OR gates)1 - 74LS00 (NAND gates)e.g.0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 and so on. mod-10 counter0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 2 2 and so on... mod-6 counterit must hav start/stop and reset function. Quote Link to comment Share on other sites More sharing options...
EnigmaOne Posted January 6, 2005 Report Share Posted January 6, 2005 You will probably find this set of lecture notes to be helpful in understanding how to create a mod-n counter. (Starting with slide #13.)These may help you as well:http://alldatasheet.com/datasheet-pdf/pdf/FAIRCHILD/74LS74.htmlhttp://www.alldatasheet.com/datasheet-pdf/pdf/MOTOROLA/74LS93.htmlhttp://www.alldatasheet.com/datasheet-pdf/pdf/FAIRCHILD/74LS32.htmlhttp://www.alldatasheet.com/datasheet-pdf/pdf/FAIRCHILD/74LS00.htmlYou should be able to find examples of data-latching circuits at discovercircuits.com (any frequency counter, tachometer or speedometer schematic would present the applied data latch concept); but it's more important to understand the various techniques for data latching than it is to merely copy a given circuit example. Quote Link to comment Share on other sites More sharing options...
yahaa Posted March 25, 2006 Report Share Posted March 25, 2006 hi you can use this link: http://www.electronics-lab.com/projects/oscillators_timers/015/index.html Quote Link to comment Share on other sites More sharing options...
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