4 digit up/down counter

Discussion in 'Homework Help' started by Mhine28, Sep 2, 2014.

  1. Mhine28

    Thread Starter New Member

    Sep 2, 2014
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    hi to all. could someone help me make an up/down counter.
    i'm having problems in making my circuit work.
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    You left out the connection between pins 4 and 6....;)

    If fixing that doesn't help, perhaps more information is in order...
     
    bance likes this.
  3. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,507
    380
    hi,
    These are 3 decade Up/Down counters, just add another stage for 4 decades.
    E
     
  4. Mhine28

    Thread Starter New Member

    Sep 2, 2014
    10
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    i'm using 7447 instead of 74247..
    is that possible?


    and can that circuit be set to start to a certain number?

    thanks for the reply.
     
    Last edited: Sep 2, 2014
  5. bertus

    Administrator

    Apr 5, 2008
    15,652
    2,348
    Hello,

    The 7447 and 74247 are comparable.
    The 247 is most likely a newer version.
    Take a look at the internal schematic of both.

    Bertus
     
  6. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,507
    380
    Hi,
    The pin outs for the 7447A are the same as the 74LS247, so they should be OK.
    E
     
  7. Mhine28

    Thread Starter New Member

    Sep 2, 2014
    10
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    ok thanks alot..
    what about 74192, im using 74193 are they comparable?
     
  8. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,507
    380
    hi,
    No,
    One is a binary counter [193]and one is decade counter.[192]
     
  9. bertus

    Administrator

    Apr 5, 2008
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    Bernard and Mhine28 like this.
  10. Mhine28

    Thread Starter New Member

    Sep 2, 2014
    10
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    can i use that circuit for multiflexing?
    i am suppose to change the number of each digit using an up/down counter.
    and if possible can you tell me how?
     
  11. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    So, this is an assignment for school. Why didn't you start off saying that?

    Why don't you post YOUR circuit that you seem to be having trouble with?

    We're not here to do your homework for you, as you wouldn't learn how to do it yourself. If you are really stuck and can't figure something out, we can help you past that point.
     
  12. Mhine28

    Thread Starter New Member

    Sep 2, 2014
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    here is the schematic diagram that I found in the internet..
    i couldn't make it work..
    schem up down counter.png
     
  13. MrChips

    Moderator

    Oct 2, 2009
    12,452
    3,371
    Don't try to fool us. You really didn't build this circuit.
     
  14. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    Is there any work you have done yourself on your homework?

    Please make a legitimate effort on solving your homework problem first, before consulting the internet - including asking us.
     
  15. Mussawar

    Member

    Oct 17, 2011
    68
    3
    I mostly build decimal counters with 40110 along with a good debouncer.
     
  16. Mhine28

    Thread Starter New Member

    Sep 2, 2014
    10
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    no i didnt...
    i said "I found" that means i searched that...
    i was hoping that if someone can tell me why even if i connect the circuit it wont work...
     
  17. tshuck

    Well-Known Member

    Oct 18, 2012
    3,531
    675
    One of two reasons it won't work:
    1. You hooked it up wing
    2. The schematic is wrong

    There are many reasons that could have gone wrong in either process. For is to tell you what you did wrong would require knowing what you did - something you haven't been very forthcoming with....
     
  18. MrChips

    Moderator

    Oct 2, 2009
    12,452
    3,371
    I said "build this circuit", not "design this circuit".

    We know you didn't design the circuit. We also know you didn't build the circuit.

    So how do you know whether or not the circuit works?
     
  19. MrCarlos

    Active Member

    Jan 2, 2010
    400
    134
    Hello Mhine28

    The circuit contained in the image that you enclose, is not quite right.
    Look at the notes I added in it. (In black and red line)

    Many of the circuits that we found on the internet do not work.
    This is another case.

    It is easier and faster if you look around here on the forums trying to find a Up-Down circuit that meets your requirements.
    You also need to study the data sheets from the ICs you intend to use
    You can get them at this link: http://www.alldatasheet.com/
     
  20. Mhine28

    Thread Starter New Member

    Sep 2, 2014
    10
    0
    thanks for the info.
    and thanks for helping me out coz im just a newbie..
     
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