bcd counter

Discussion in 'Homework Help' started by jassy, Jan 23, 2009.

  1. jassy

    Thread Starter New Member

    Jan 23, 2009
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    i need the equivalent of bcd counter using relays. big thanks!
     
  2. Wendy

    Moderator

    Mar 24, 2008
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    Suggestion, look up something like a 7490 datasheet, where the logic layout is printed, then use that as a basis.
     
  3. jassy

    Thread Starter New Member

    Jan 23, 2009
    6
    0
    i tried to find the one refered to me about the BCD Counter but can't. I just don't know my instructor required us to do the wiring diagram of the bcd counter using relay switches instead of 555 timer. we're done with the wiring diagram of the differentiation-up (relay) but the binary counter and the 7 segment's display we're only given with relay logics. he said that upon connecting the dif-up to the binary counter and the 7 segment display you'll end up with the bcd counter. eeeh... dunno how... i badly need help.

    big thanks!:)
     
  4. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    You can't use a 555, it is analog with a digital output. You need to come up with a Set Reset Flip Flop using relays, then move on to a Master Slave Flip Flop. With those two functions it can be done, though adding a JK function does clean it up, and allow you to steal the logic diagram off of the chip.

    You are in the world of digital, think gates.

    Hint:

    Wikipedia article on Relay Logic...

    http://en.wikipedia.org/wiki/Relay_logic

    Another hint:

    Draw what you want using simple gates.
     
    Last edited: Jan 26, 2009
  5. jassy

    Thread Starter New Member

    Jan 23, 2009
    6
    0
    thanks!@ gotta try it today.:)
     
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