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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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24th Oct 2016, 8:26 pm | #21 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,173
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Re: Construction of another digital clock
Hi Miguel, yes the 7490 was the chip of choice for clock builders here many years back.
As long as you de-couple well (0.1uF on each chip, direct on the Gnd and Vcc pins) they work very well. Ed |
29th Nov 2016, 3:31 pm | #22 |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
I have soldered all the components for the minutes and seconds counters. Here a picture.
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29th Nov 2016, 5:00 pm | #23 |
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Re: Construction of another digital clock
I love the single sided (sort of) design, surface mount but bigger, the links are good too. You can debug the whole thing from one side if needed. I do something similar with 'real' SMT (surface mount technology) components and usually have a double sided board the back side of which is ground only (saves exposing and etching the back!)
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29th Nov 2016, 5:10 pm | #24 | |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
Quote:
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29th Nov 2016, 5:53 pm | #25 | |
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Re: Construction of another digital clock
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2nd Dec 2016, 4:38 pm | #26 | |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
Quote:
Here the other side of that PCB with the hours counter.
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20th Dec 2016, 4:13 pm | #27 |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
This is the time base that I will use for the clock. It is the PCB of a quartz "analog" clock. TO-92 transistor for size comparison.
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When electrons move, things happen. There's nothing you can do that can't be done. |
20th Dec 2016, 6:09 pm | #28 |
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Re: Construction of another digital clock
Can you pick up WWVB (the 60kHz American time service) in Cuba? From their coverage maps it looks likely. If you want a receiver I have a few left over from a project, yours for the asking, drop me a PM.
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20th Dec 2016, 7:01 pm | #29 |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
Not sure about that. I will ask some expert here in Cuba if that is possible.
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When electrons move, things happen. There's nothing you can do that can't be done. |
20th Dec 2016, 7:50 pm | #30 | |
Dekatron
Join Date: Jan 2005
Location: Oxford, UK.
Posts: 17,820
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Re: Construction of another digital clock
Quote:
Here's some useful info: http://sound.whsites.net/clocks/timebase.html |
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22nd Dec 2016, 12:59 pm | #31 |
No Longer a Member
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: Construction of another digital clock
Hi Miguel,
A clock based on discrete logic IC's is always a wonderful project. (much more fun than a PIC based one, if I can say that without treading on anyone's toes) Especially 74 series IC's. I have made a number myself over the years. It is pretty well the right of passage for every electronics enthusiast to build a clock at some point. Perhaps it is the enigmatic nature of time, making it more attractive too. The last one I built, I wanted it to be battery powered so I went for vintage 4000 series cmos. To "go the whole way" I made it 12hr (with AM/pm indicators) or 24Hr, and count up or down so I could use it as a countdown time to trigger an event. The displays are made by Innocor (hard to get) but they are the cmos equivalent of the famous vintage Texas TIL311. I also added a 1/10 sec column which looks great, especially on counting down. One trick used in it, that you won't see often, is the use of XOR gates to mix in the time set control buttons to each counter IC. Also the time-base is an Epson IC that has an internal crystal. It runs on 4 re-chargeable AA cells, and built into an OKW case. If you want to see this cmos clock, it is here and the circuits are there to see how I did the 12-24hr logic etc: http://worldphaco.com/uploads/THE_CMOS_CLOCK.pdf |
22nd Dec 2016, 2:45 pm | #32 | |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
Hi Argus. Nice masterpiece of clock!!!!!! Wonderful!!!!.
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22nd Dec 2016, 3:32 pm | #33 | |
Pentode
Join Date: Oct 2012
Location: Dorset, UK.
Posts: 240
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Re: Construction of another digital clock
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22nd Dec 2016, 3:40 pm | #34 |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
Very interesting idea. I will not use it this time as I have several PCBs of quartz clocks to use, but definitively something to have into account. Thanks.
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When electrons move, things happen. There's nothing you can do that can't be done. |
6th Feb 2017, 5:19 pm | #35 |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
This is the cabinet for the digital clock. It still need painting but my wife and I are in the process to decide if paint it in white or dark brown. It has that triangular shape as it will be placed in a corner of the kitchen.
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When electrons move, things happen. There's nothing you can do that can't be done. |
22nd Feb 2017, 5:16 pm | #36 |
Heptode
Join Date: Dec 2011
Location: Mayabeque, Cuba
Posts: 617
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Re: Construction of another digital clock
Finally I painted the clock cabinet in dirt magnet.....I mean, white. I placed it in a corner in our kitchen, above the fridge. I wanted to take a panoramic picture but my wife said that the kitchen was not "presentable". Is any kitchen presentable?
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When electrons move, things happen. There's nothing you can do that can't be done. |
22nd Feb 2017, 5:37 pm | #37 |
Dekatron
Join Date: Jun 2016
Location: London, UK.
Posts: 3,687
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Re: Construction of another digital clock
Looks very good. Always nice to see a completed and working project.
And indeed, no kitchen is presentable, especially not mine |