Help us !

Discussion in 'Homework Help' started by tiacamkia, Mar 23, 2010.

  1. tiacamkia

    Thread Starter New Member

    Mar 23, 2010
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    How do you design a circut using 74LS190 or 191 that can count from 2 to 7 continuously . I know you would have to use some sort of NAND or AND gate just unsure how.
     
  2. tiacamkia

    Thread Starter New Member

    Mar 23, 2010
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    =] helpppppp!
     
  3. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    2 to 7 continuously ?
    I a bit lost here.
    Could you give a bit more details.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Use the '191 - it has a preset control. The clock following the count to 7 presets to 2.
     
  5. tiacamkia

    Thread Starter New Member

    Mar 23, 2010
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    as in go 2.3.4.5.6.7 and then go back to 2and count to 7 again repeatedly
     
  6. tiacamkia

    Thread Starter New Member

    Mar 23, 2010
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    how do you get it to preset back to 2
     
  7. tiacamkia

    Thread Starter New Member

    Mar 23, 2010
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    ????????????????
     
  8. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Get a data sheet for the 74LS191. It explains it all.
     
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