Great new clock....

[Nick]

http://imgur.com/a/iMXmj?dm_i=25MP,2MYDC,GCGNM3,9MW94,1

...based on http://www.qlocktwo.com/ 

Nick

[Nicholas Stock]

Wow, nice clock and a lot of work!

If anyone is interested in building something similar (or purchasing a complete one) I can thoroughly recommend..

http://www.seeedstudio.com/depot/wyolum-m-54.html

ClockTHREE Jr.

On Wed, Jul 16, 2014 at 3:57 AM, Nick <ni...@desmith.net> wrote:

http://imgur.com/a/iMXmj?dm_i=25MP,2MYDC,GCGNM3,9MW94,1

Nick

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[Dman777]

I have a ClockTHREE Jr. and love it. 

[Paul Parry]

Also seen these here: (or very similar)

 

http://www.dougswordclocks.com/product-category/word-clock-kits/

 

 

[Dave]

This is a great blog.
Instead of skipping the messy parts, you show it all and will save others time and money.

I would like to see you to post your code.

Here is another word clock.  What I like is that it show the process of creating and more importantly, mounting a stencil set of words:
Black Stencil based Word Clock

[greg...@hotmail.com]

Now, if only these clocks were neon.....swapping NE2's for the LEDs is certainly possible; my big clock uses 306 individual NE2's. The bulbs are not controlled individually, I have them grouped to 72 individual drivers.

I recall that Burroughs made alphabetical nixie tubes. Not segmented tubes, like the 7971, but real fully-formed cathodes shaped like letters. The 5018 purportedly had letters ABCDEFGHJK (note that I' is missing), though I've never seen one. If any of you have been fortunate to make a project with these, please post a picture.

[Nicholas Stock]

Greg, I'd be interested in seeing details of your large clock...do you have a blog/website? Can you multiplex NE2's easily...I have no experience with this, just curious.

On Thu, Jul 17, 2014 at 10:19 AM, greg...@hotmail.com <greg...@hotmail.com> wrote:

Now, if only these clocks were neon.....swapping NE2's for the LEDs is certainly possible; my big clock uses 306 individual NE2's. The bulbs are not controlled individually, I have them grouped to 72 individual drivers.

I recall that Burroughs made alphabetical nixie tubes. Not segmented tubes, like the 7971, but real fully-formed cathodes shaped like letters. The 5018 purportedly had letters ABCDEFGHJK (note that I' is missing), though I've never seen one. If any of you have been fortunate to make a project with these, please post a picture.

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[greg...@hotmail.com]

Here's a not-so-good picture. Basically the NE2's simulate the large & small hands of a traditional mechanical clock, and the outer digits are nixie tubes. The NE2's are grouped into 36 'rays'. Each ray represents 100 seconds for a minutes-hand, or 20 minutes for the hours hand. The hours hand is shorter, so the rays are split into inner-rays (for the hours and minutes hands), and outer-rays (for the minutes-hand only). Towards the center, the innermost bulb is shared between adjacent rays, because you can make a smaller circle with 18 bulbs than you can with 36 bulbs. 36rays * 8 bulbs per ray = 288 bulbs. Then an additional 18 for the center = 306 bulbs, which means 306 dropping resistors. Yes I had fun soldering this.

Each ray is driven by an opto-triac, which applies AC to the bulbs so both electrodes glow. If I used transistor drivers, it would require DC and therefore only a single electrode would glow. Not only does this reduce brightness, it probably reduces lifetime. The 72 opto-triacs are driven by TTL latches (74LV374), and they are connected in series to reduce PCB and cable wiring. This in-turn is controlled by an FPGA, which sends the light-bulb information serially at about 1 Mhz when the AC-line-voltage is around zero volts. If I did not do this, there would be streaking of other rays. The FPGA monitors the AC-line to know when the zero-cross occurs, and also uses it as the time-base.

Although I developed a PCB for this, I dont intend to sell / give-away the design because I dont have the time to support it. It would take away from my time I want to spend on other projects.

[Nicholas Stock]

Very nice! Thanks for sharing.

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