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Need help in digital clock (hour, minute, and second) circuit

Discussion in 'Electronic Projects Design/Ideas/Reviews' started by dj_ash1983, Oct 15, 2006.

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  1. m3tasm_elzayat

    m3tasm_elzayat New Member

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    then if u dont mind give us ur diagram
    i just strated in this project
     
  2. pizzamix

    pizzamix New Member

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    Hey, I have a school project for building a digital clock, and i have been using this thread as a reference. I was originally going to use 74161 counters, using their ENT and ENP leads to make them count to "59" correctly. After reading this, though, decade counters seem easier. My question is, can i use a 1Hz crystal oscillator circuit instead of the LM555? I have spent a few weeks in class building the oscillator using a 4060 chip and a 161 to limit the frequency to 1 Hz. Also, could someone post the full schematic? =(
    I am using Electronics Workbench to plan out the schematic, but my school only has the 1996 version, and it seems a bit outdated. The seven segment displays on EW are hard to understand (for me anyway) and i am having trouble replicating this circuit. Any help will be appreciated! Thanks!
     
  3. m3tasm_elzayat

    m3tasm_elzayat New Member

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    i also already finshed my digital clock project except pulse generator and Temporarily use ic 555 i asked my prof, he tell me the output pulse of 555 my be shanged more than or less 1 hz coz of rising temp of the ic , crystal oscillator is sutable but the problem in dividing the frequancy , also dividing the AC voltage of frequang 60 HZ not good idea
    [​IMG]
     
  4. dave

    Dave New Member

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  5. Wond3rboy

    Wond3rboy Member

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    Ending finally!

    Hi i was helping a junior of mine on the same subject and i stumbled upon this great PDF. Its uses 6 counter IC's(7490) and is very nice if you see how it works and all.It shows the versatality of 7490 for use a multi mod counter.
     

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    Last edited: Apr 10, 2009
  6. logoleaf

    logoleaf New Member

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    Need to finish project

    Hello everyone. I'm new here and looking for a real help. I know that it's kinda freak me out to ask people for a diagram but time is running out for me. I have to turn in my project on 5/13/09. I've been sitting around to draw a diagram to make it works but, unfortunately got no luck. Now asking for dj_ash1983 to post a diagram. So, i can have it put together in 2 days. I would either turn in project or get 00 points. So, please help by post a diagram here or send it to <snip>. Any help or suggestion would be really appreciated because i'm out of thinking. Thanks in advance guys.:(
     
    Last edited by a moderator: Aug 21, 2015
  7. Harke

    Harke New Member

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    Help

    You can make minute hand as the same way what you have done for the second hand.To make twelve hour digital clock is very difficult task since after twelve we have to set it to 01.
     
  8. mneary

    mneary New Member

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    Are you answering the 2006, 2008, or 2009 part of the thread?
     
  9. ramili

    ramili New Member

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    Hi everybody! I'm doing the same project, I was reading the pdf file you attached about the digital clock, so I understand that second and minute part look the same, and when the the ten digit become 6 I have to reset the whole thing which I think they already did, and connect the output of the second part to the clock of the minute part, here is my question what is this output, what pin number of the second part has to be connected the the minute part? please give me the exact pin number, I'm getting a little bit confused! Thanks
     
  10. jovelll

    jovelll New Member

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    I'm currently making a 12 hours clock..can you give me an advice as to how to make it 12 hours..I'm really having a hard time with it..I'm done with minutes and seconds..pls do help me..
     
  11. arvinpaul_juare

    arvinpaul_juare New Member

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    hi, can i have the circuit of this digital clock...i tried many times but until now it doesn't have any display
     
  12. james2554

    james2554 New Member

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    Hours,mins and second project nedd help!!

    Can anyone show me a schematic of a 24 hour clock that counts hours,mins and secs using 74hct161 chips thanks
     
  13. bledza

    bledza New Member

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    please i nid the same data as asamaster on digital clock display circuit my email is <snip>
     
    Last edited by a moderator: Aug 21, 2015
  14. mazaismo

    mazaismo New Member

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    please i want a full schematic diagram of a 24-hour digital clock circuit using 7490 as main ic or any ic , i really need it badly....my email is
    <snip> thanks
     
    Last edited by a moderator: Aug 20, 2015
  15. argeopaladin

    argeopaladin New Member

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    We are already finished making d clock. But the problem is how to design the hours so that after reaching 11:59, it will go back to 01 instead of 00. Anyone can help?
     
  16. leocheong

    leocheong New Member

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    Please!!! I want a full schematic diagram of a 24-hour digital clock circuit, and it's about used only pulse generator (analog circuit using LM555), decade counters (74LS90), BCD decoders (74LS47), AND Gate ICs (74LS08), and 7-segment LEDs.
     
    Last edited by a moderator: Apr 5, 2012
  17. emem118

    emem118 New Member

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    may i ask you,what is the value of the capacitor and resistor??i really appreciate your reply as soon as possible.thanks.
     
  18. romzkid

    romzkid New Member

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    that's also my problem... i cant find a way to make up for my hour using 74LS192
     
  19. nhep

    nhep New Member

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    hey man can you give me a schematic diagram pls.i need help in my project,digital alarm clock,with ic 7447 and 7493 if im not mistaken 7493 and 7490 is the same?
     
  20. AnalogKid

    AnalogKid Well-Known Member

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    This thread is almost three years old.

    ak
     
  21. JimB

    JimB Super Moderator Most Helpful Member

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    Actually, it is nearer nine years old.

    As most of the recent posts seem to be of the form "Give me the schematic", it is probably time to close the thread.

    JimB
     
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