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Digital Master Clock with 7 Seg LED Displays & Hourly Ch

Discussion in 'Electronic Projects' started by oliverb, Dec 5, 2005.

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  1. wombweller

    wombweller Member

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    Hi Brett

    I think you may be in luck!! I have searched for such information for a while.I have found some info from which I will duplicate to make my own version msf. clock.

    Hans summers created an msf. clock some years ago.He used a bunch of 74lsxxx IC's to decode the NPL. time signal.I would use the updated version of those IC's. He does provide a very comprehensive parts list and Schematic he does also show at what point you get a 1 hz signal from the circuit and how it actually decodes the signal.You will deffo get the info you require to get your clock going with his info.

    Alternatively and much simpler than Hans set up is the Em2s MSF. receiver add this to a 60khz antenna and you have the parts required to get your master clock going.

    Radio Controlled Clock : Report

    MSF Receiver modules for OEM development of products

    I hope this info helps,I think it will and I do hope you try it out as it will be a bonus to your clock.

    Cheers!!



     
  2. wombweller

    wombweller Member

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    Bob

    Wish I could afford one of those myself!! I do like his website and I often view and dribble all over my keyboard while viewing.

    I am creating a similar clock with astro dials but mine is from a combo of 30 and 1 sec impulse slaves and a bit of circuitry to boot for a calender dial with auto correct.I have not yet decided if I should timebase this clock via a 1 sec pendulum or electronics my preference is to use an ex sync or gpo. pendulum as give a good visual aspect all housed in an early Gent master case.

    Cheers!!
     
  3. oliverb

    oliverb Member

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    Thanks bobledoux. That was the look I was after.
    I looked at the dials on 10 differant regulator clocks and picked out the feature that I thought looked best. I went for hours and seconds showing 1 to 60 not 0 to 59, hours in Arabic rather than Roman in 24 hours not 12 hour. I also added a leading 0 to the 24 hour numerals from 1 to 9 to keep the hour dial balanced.

    The dial was then drawn using a cad program and printed out on Lazertran transfer paper before being transferred to a blank dial that I sprayed off white. The dial was then sprayed with varnish to make the Lazertran backing tranparent to show the dial background.

    The case was from an old 12" school clock, I have stored away the dial and movement for safe keeping.

    wombweller & gaspode42
    Thanks for your replies. I have printed out the design from Hans but I like the look of the ready built modules as my clock is full to bursting already!


    Off the top of my head I will need a bit of logic circuitry to sych the seconds on the hour pulse from my clock. If a MSF seconds pulse is present the seconds timebase is reset to this pusle. If not present due to a loss of signal the clock will run off it's own quartz crystal.


    Thanks again. Brett.
     
  4. dave

    Dave New Member

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  5. wombweller

    wombweller Member

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    Sounds interesting Brett!! could you give me the nod if you come up with something?

    Mark
     
  6. oliverb

    oliverb Member

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    No problems. I have checked out the cost of a pre built MSF module and antenna and it comes to around £50.

    I have ordered an £8 radio alarm clock off ebay to see if I can hack the parts I need. I through 2 of these out last year.

    I'll let you know how I get on.
    Brett.
     
  7. oliverb

    oliverb Member

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  8. alaajh

    alaajh New Member

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    thank u very mutch
     
  9. oliverb

    oliverb Member

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    Master Clock Word doc download

    Thanks to the help from members of this froum I have now completed my DCF77 decoder.
    I have now fitted it to my Master and it is keeping perfect time after 6 days.

    I have written up a word doc on my Master Clock that includes full details of the DCF77 decoder. The doc is 48 pages long and I have included all the diagrams and vero layouts I could find along with many photos.

    While I'm sure no one will want to build the whole clock there may be parts that may prove useful.

    The Word file is 25megs. I am unable to post the attachemnt to this forum so have pasted a link so it can be downloaded. This link only lasts 29 days so perhaps by then I will have managed to post it on the forum.

    Brett.
    edit new word updated use same link to download pics below added to file

    https://vstuff.virginmedia.com/n/50-17/share/LNK21424a2c3cc6a8a20/
     
    Last edited: Jun 9, 2009
  10. oliverb

    oliverb Member

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    Master Clock pics

    Here are a couple of pics of the modified Master showing main display panel contols and also a view from below showing control switches.

    Note I have added these pics to my Masterclock Word doc see temp download link above.
     

    Attached Files:

    Last edited: Jun 9, 2009
  11. oliverb

    oliverb Member

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  12. oliverb

    oliverb Member

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    Battery backup

    Thanks to the help from members of this forum my battery backup is now working.

    I have added details into the Master Clock word doc now at version 4

    You can download it from here for the next 30 days. If you find this link after the 30days have expired let me know and I'll reactivate it.

    https://vstuff.virginmedia.com/n/50-...4a2c3cc6a8a20/

    Brett.
     
  13. nike6

    nike6 Banned

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    SkyDrive - Windows Live

    Microsoft's new online storage - 25 Gbyte
    no timed restrictions, and nice HTML code to embedd the downloads.
     
  14. oliverb

    oliverb Member

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    Last edited: Jun 19, 2009
  15. oliverb

    oliverb Member

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  16. wombweller

    wombweller Member

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    Hi Brett

    I noticed from you updated web site that you used a small relay with a bell hammer attached for the bell strike.what sort of relay did you use and did it prove worth while?

    Mark
     
  17. oliverb

    oliverb Member

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    Hi Mark it is not really a relay. It's a 30sec clock motor with the gears stripped out.
    Brett.
     
  18. wombweller

    wombweller Member

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    Hi Brett

    Realise that you made a bell ringer form a slave clock movement but also along side that from your website is another option using a relay or am I confused:eek:
    http://www.electro-tech-online.com/threads/digital-master-clock-with-7-seg-led-displays-hourly-ch.18901/#post122679

    I'm just making one of my own but I ended up using a converted post office type relay (3000) Just thought yours with a miniature relay would be more compact!!!

    Mark
     
    Last edited: Jul 14, 2009
  19. wombweller

    wombweller Member

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    Just wondered what type of relay it was and if it performs ok!!!

    Mark
     
  20. oliverb

    oliverb Member

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    Hi Mark
    The relay is just a small 5v relay (can't remember which one) that had a large armature so I could attach the wire to strike the old telephone bell.

    This option is very compact and sounds nice but is not very loud. In the end I went for the large 4" bell and slave movement that can be heared all round the house. If you have more than 5volts to play with then you will have more of a choice of relays.

    Your PO type relay sounds a good option though.
    Brett.
     
  21. knaaphix

    knaaphix New Member

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    Good Job I like The idea
     
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