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Science Meets Style In This Cathode Tube Watch

scope-n-SHOUT writes "The Nixie Watch displays the time on nixie tubes, a cold-cathode tube filled with neon, a little mercury and argon at a small fraction of atmospheric pressure. Nixies were used in many early electronic desktop calculators, including the first: the vacuum tube-based Sumlock-Comptometer Anita Mk VII in 1961. This two-digit wristwatch is designed for everyday use, being water-resistant and rugged, not to mention looking really retro-future cool. The watch requires no button pushing to operate - it shows the hours, minutes and seconds in sequence at the flick of the wrist. For the hardcore code tweaker, a programming adapter allows the GPL'd PIC firmware running the watch to be hacked up at will. The Nixie Watch is being sold in very limited edition, with each piece individually numbered and engraved."

36 of 190 comments (clear)

  1. Why a watch? by avalys · · Score: 4, Insightful

    It seems like a watch is the wrong form factor for this thing. The idea is really cool, and I think I might actually buy one if it was made as a desk clock, but I wouldn't want that enormous hockey-puck-sized-thing strapped to my wrist all day.

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    This space intentionally left blank.
    1. Re:Why a watch? by Jerry+Coffin · · Score: 5, Informative
      It seems like a watch is the wrong form factor for this thing. The idea is really cool, and I think I might actually buy one if it was made as a desk clock, but I wouldn't want that enormous hockey-puck-sized-thing strapped to my wrist all day.

      Something like one of these or these?

      --
      The universe is a figment of its own imagination.
    2. Re:Why a watch? by Detritus · · Score: 2, Interesting
      A 7-segment display needs a 7-segment decoder to drive the appropriate segments for each digit. That's a fair bit of extra circuitry and expense when your logic circuits are built from discrete components.

      Some older equipment used displays that were like miniature slide projectors. Each digit had a small rear projection screen. Behind that screen was an assembly of miniature light bulbs and optical slides. When one of the light bulbs was turned on, its light passed through an optical slide that had an image of the desired digit. It produced a very readable display, better than Nixies or 7-segments. This display was designed and manufactured by Industrial Electronic Engineers, Inc. starting back in the late 1950s, and amazingly enough is still alive and in the display business.

      --
      Mea navis aericumbens anguillis abundat
    3. Re:Why a watch? by ajs318 · · Score: 4, Informative

      Nixie tubes are based on the same technology as the neon lamps you find on mains extension leads and some appliances {from the pre-LED era, or ones that don't have any low-voltage electronics inside them} and in power-finder screwdrivers. These simple lamps are just a glass tube with two electrodes, connected to the mains through a ballast resistor {or in the case of a power-finder, the capacitor formed between the whole surface of your body [not, as per common misconception, just the soles of your feet] and the earth; AC can flow through a capacitor because it is being continuously charged and discharged}. The tube is filled with a mixture of gases, mainly neon and argon, which become conductive and emit light when a sufficiently high voltage is applied. The glow occurs in the space between the cathode {negative terminal} and the anode {positive terminal}, but always nearest to the cathode. Note that the mains is AC, so each electrode glows on each alternate half-cycle; but since there are 50 cycles every second, your eyes cannot detect this.

      In a Nixie tube, the cathode wires are shaped into numbers {or letters, or symbols} and each one is brought out to a separate terminal pin. The anode is a fine wire mesh grille in front of the cathodes. This is connected, through a ballast resistor {to limit the current} to a positive supply of several tens of volts DC {dependent upon the size of the tube}. When one of the cathodes is connected to ground, the gas ionises and a visible glow is given off around the cathode. The smaller the resistor, the bigger the current, and the further the glowing region extends {and the shorter the overall lifetime of the tube, since some material is transferred }; the general aim is to get a strong enough glow around the active wire so the whole digit is visible. Note that if a switched-mode power supply is being used to generate the high voltage, it will most probably already have a high enough output impedance so as not to need a ballast resistor.

      The cathodes can be driven by ordinary, open-collector NPN transistors but they must be selected carefully: the collector-base junction must have a sufficiently high breakdown voltage to withstand the display drive voltage. Otherwise the C-B junction will behave like a Zener diode, essentially dropping a constant voltage irrespective of how much current is flowing through it; and once a digit has been lit, it won't extinguish until the anode supply is interrupted. It won't actually fail catastrophically due to the ballast resistance limiting the current; but it probably is not what you want anyway. If the anode supply is switched-mode, and the output capacitor is small enough that this afterglow can discharge it completely, you might just be able to get away with using under-rated transistors to switch the cathodes; but this is not ideal since the anode supply will always be dying {not just in the afterglow while the transistor is staying on} and the display will flicker.

      --
      Je fume. Tu fumes. Nous fûmes!
  2. So its basically the complement of Slashdot by ghoul · · Score: 4, Funny

    where Science meets a total lack of style ;)

    --
    **Life is too short to be serious**
  3. What time is it? by Bonker · · Score: 4, Funny

    *flick* *flick* *flick*

    Dammit... too far.

    *flick* *flick* *flick*

    11... No, I'm sorry, that's the minutes.

    *flick* *flick* *flick*

    Something 11.

    *flick*

    And 15 seconds.

    --
    The next Slashdot story will be ready soon, but subscribers can beat the rush and slashdot the links early!
  4. Not by DumbSwede · · Score: 4, Insightful
    "...really retro-future cool" -- NOT

    Maybe 4 smaller nixie tubes, but this first hours then minutes then seconds display on two digits looks more like a bad high school science project than a must have geek item.

  5. A real conversation with my wife by Dark+Paladin · · Score: 4, Funny

    Me: Hey, honey - take a look at this watch.

    My Lovely Wife (MLW): Oh - uh, what is that?

    Me: Cathode ray tube watch.

    MLW: Oh. How much is it?

    Me: About $400.

    MLW: $400 for that?

    Me: Yeah. And you know what?

    MLW: What?

    Me: That is the exactly opposite of what kind of a watch I want you to buy me for Giftmas someday.

    MLW: Got it.

    1. Re:A real conversation with my wife by AuMatar · · Score: 2, Funny

      Exact opposite? So you're waiting for the anode version?

      --
      I still have more fans than freaks. WTF is wrong with you people?
  6. Not the only one by wkitchen · · Score: 4, Informative

    It's been done before. And with more digits.

  7. Too bad these weren't around in 1984... by Tsar · · Score: 2, Interesting

    Terry Gilliam would have loved to have had these in Brazil !

  8. Cost vs. Reward by mister_llah · · Score: 3, Funny

    Cathode Tube Watch: $395
    Tiger Print Suit: $2530
    Authentic Aviator Goggles: $125

    Realizing that you have the fashion sense of Helen Keller: Priceless

    --
    MoM++ - A Classic Expanded - [Master of Magic 1.5]
    http://mompp.sourceforge.net/
  9. Slashdotted already? by FlyByPC · · Score: 3, Funny

    What, are they running the webserver on Nixie tubes, too?

    --
    Paleotechnologist and connoisseur of pretty shiny things.
  10. Science Meets Style??? by syousef · · Score: 2, Funny

    More like impracticality meets extravagance.

    --
    These posts express my own personal views, not those of my employer
  11. So when did /. become such an ad pusher? by Fallen+Kell · · Score: 2, Insightful

    Just wondering. Did you get any decent amount of money for that huge ad? I sure hope you did since this probably sent more traffic their way then anything else has in the past.

    --
    We were all warned a long time ago that MS products sucked, remember the Magic 8 Ball said, "Outlook not so good"
    1. Re:So when did /. become such an ad pusher? by Anonymous Coward · · Score: 2, Insightful
      Just wondering. Did you get any decent amount of money for that huge ad?

      OMG!!!! SLASHDOT is linking to an item FOR SALE!!!!
      LIES CORRUPTION END OF THE WORLD!!!!

      ... or maybe it's just a link to a small company with a cool product. Stop acting so self-righteous and get over yourself.
      Are you really suggesting that slashdot shouldn't link to any product or service that is offered for sale?

    2. Re:So when did /. become such an ad pusher? by Total_Wimp · · Score: 2, Insightful

      Just wondering. Did you get any decent amount of money for that huge ad? I sure hope you did since this probably sent more traffic their way then anything else has in the past.

      I don't understand how this got modded +5 "Insightful." I mean, were all the XBOX 360 articles somehow enlightening to geeks, but this one is all of a sudden an "advertisement" because some dude will (gasp!) make money off of the product?

      I just checked the front page (3:35 am EST) and found that 4 of the 10 articles are about either for-profit companies or the products they sell. Until geeks stop liking to buy stuff, maybe you should save this kind of comment for Mother Jones magazine or something.

      I don't mean to crack on you so hard but, damn, the product is nerdy ("news for nerds"). I might buy into your logic if the article was about scrub brushes or something.

      TW

  12. This actually is a pretty cool watch... by John+Miles · · Score: 5, Insightful

    ... if only for its homebrew-deco appeal. According to the .PDF copy of the user manual on the site, the software that runs it is GPL'ed and fully user-compilable/modifiable. The complete schematic is provided with a nifty discussion of the underlying circuit theory.

    Aesthetically, yeah, it's hard to argue that it's not a piece of junk. The first thing you notice -- because your eye expects to see two more Nixie tubes -- is the huge battery next to the two that are present. That should have been a stack of heavy-duty lithium coin cells mounted out of sight. If they'd gone that route, then the housing could have accommodated three tubes... which 85% of the time is all you need, right?

    It doesn't deserve the bashing it's getting on a "News for Nerds" site, at any rate. Everybody reading Slashdot has scarier stuff than this in their (psychic?) basements.

    --
    Dahlmann tightly grips the knife, which he may have no idea how to use, and steps out into the plain.
  13. Back in the day... by boomgopher · · Score: 4, Interesting

    When I was in the military some years back, we were still using some test equipment with these tubes as displays. The subtle beauty of them is when the digits would cycle through a sequence, you'd notice the position/depth change as it changed to a new digit. Coupled with the fadeout of the deactivated digit, it was a fascinating to watch.

    --
    Your hybrid is not saving the environment. Its purpose is to make you feel good about buying something.
    1. Re:Back in the day... by cocotoni · · Score: 4, Funny

      You Sir are the last person I would like to have watching the countdown for an important defense missile:

      10... 9... 8... 7... 6... ooh, shiny... 4... and look at the depth change...

      Only kidding :)

  14. Meh, if it was trully geek by antifoidulus · · Score: 3, Funny

    it would tell time in hex :P

  15. Re:Thank you, Johnny Olsen. by redheaded_stepchild · · Score: 2, Insightful

    At 395 bucks I think I can say for sure, the price is not even close to right.

    --
    Don't use the Troll mod just because you disagree with me.
  16. Science Meets Style by marcushnk · · Score: 3, Informative

    Science Meets Style... and Style walks away with a bloody nose.

    Seriously people.. this does not look cool, neat, retro, funky or any thing other than an ugly lump on the end of an appendage.

    --
    "Consider how lucky you are that life has been good to you so far. Alternatively, if life hasn't been good to you so far
  17. Much cooler version by wrmrxxx · · Score: 2, Informative

    There's been a very impressive Nixie wristwatch at http://www.amug.org/~jthomas/watch.html for quite a while now - he made it in 2001. The fact that it doesn't even use a microcontroller makes it that much cooler. Less flexible because you can't re-program it, but far more in keeping with the theme of the project.

  18. Science meets style? by Flying+pig · · Score: 3, Interesting
    Obsolete engineering meets design disaster area.

    Seriously, years ago I actually encountered a Geiger counter (don't ask) which used transistors to drive Nixie tubes. In those days there were no high voltage transistors, so it worked around the idea that the Nixies turned off at a certain voltage, therefore the VEBO of the transistors did not need to exceed the difference between the high voltage rail and the Nixie cutoff voltage.

    Did you notice the words "Geiger counter" there? Yes. Of course, if the radiation reached a level sufficient to ionise the gas in the tubes, they stayed conducting. So turning a small gamma source on the tubes themselves blew all the output transistors.

    --
    Pining for the fjords
  19. $395 too! by commodoresloat · · Score: 4, Interesting

    If I wanted to buy a watch that guaranteed I would never get laid, I certainly wouldn't have to spend that much on it.

  20. No, its different. by imsabbel · · Score: 3, Informative

    We have really old (and back then expensive) frequency counters here that use the same display technology.

    Its basically a glow discharge tube like you can find them as gadgets sometimes (like a hearth, or a number or so glowing). The glow is around the kathode, which can be formed however you want.

    So this tubes have 10 different kathodes in one tube, sorted by visibility (to but the "big" shapes back as to not hinder the view to other ones). All in all, you can see that they are in different planes (about 5-8mm or so, which makes neat effects for a frequency counter (as the digit seems to jump rapidly, seemingly randomly back and forth in 3d-space)).

    --
    HI O WISE PRINCE. WHT TOOK U SO DAM LONG?
  21. It's not that simple... by nickds · · Score: 5, Informative

    Making a nixie watch is enormously complicated - the power issues are complex - the tubes need 180VDC at a few mA to strike, but the batteries must last for 6 months or so. Each watch is hand made and uses lots of SMD components - the tubes are indeed not the smallest available as they are not made any more, so you can only use "common tubes" - the earlier 4-tube watch mentioned used JAN7009/4998 tubes which are extremely rare (the builder found a one-off small batch at a hamfest), and can't be used for commercial construction. It's not ideal, using these tubes, but it does work. Other common small tubes, like the Russian IN-17s have other problems (they are too deep). I actually have one of these watches (a prototype), and it attracts nothing but admiration, even from my wife & daughter. You do need big wrists, though (I'm 6' 4" tall and 103kg)... David only did this as a bit of fun - he deserves credit for producing something that's fun, with little profit (if any) for an awful lot of hard work. Nicko

  22. The only problem... by squoozer · · Score: 2, Funny

    ... after 3 weeks of wearing this watch your hand goes black and drops off.

    --
    I used to have a better sig but it broke.
  23. ...power is a problem... by nickds · · Score: 3, Informative

    He looked at lithium cells, but the supplier would not let him have samples, and the MOQ was in the order of 10,000 units (or $$, I can't remember), so the "common camera battery" route was taken... Again, it's a compromise. The reason the tilt-detector (a solid-state Analogue Devices unit) is used is that the HT converter is only activated whn the watch is at 45 degrees or so the the Earth. As you tilt the watch, you can just hear the HT boost converter starting (a very slight whstling) if you put your ear to the watch... Assuming the HT supply is 90% efficient (typical for this sort of unit), to get 180VDC at 3mA, you need about 200mA at 3V from the battery - Obviously you can't let that run continuously as any battery would be flat in a few hours, hence the tilt-detectors. Everything is a compromise... but it really does work... Nicko

  24. Is that a clock on your wrist? by digitaldc · · Score: 2, Funny

    Or are you on house arrest?

    --
    He who knows best knows how little he knows. - Thomas Jefferson
  25. more nixie clocks from my watchmaker by wayne · · Score: 2, Informative

    A friend of mine has made quite a few nixie clocks, including one that sync's its time to WWVB. They are cool to watch.

    --
    SPF support for most open source mail servers can be found at libspf2.
  26. I have one by HWguy · · Score: 2, Interesting

    I have one of these. It may not be for everyone but I bought it because:

    - It uses nixie tubes. I think they are the nicest of all digital display technologies. I like the fully formed numbers and I like the 3-dimensional movement as the digits change.
    - It was designed and manufactured by one person. I think that is quite an accomplishment and makes for a much more personal and unique timepiece.
    - The designer released the firmware under the GPL. This is the only watch in the world that I know of that can be reprogrammed by its owner. The designer put a lot of neat features into the firmware and given the uC is a PIC this is no small feat. I'm surprised more ./ers don't really appreciate this.
    - It is a fairly complex design including a 180 volt power supply and an accellerometer to trigger the display. There are several PCBs assembed together in 3D in this watch which I like.
    - It is large and not for everyday use. However the size and quality of the case make it stand out. I wear watches to be noticed and this one certainly is. I added a gel sheet to the watch which accents the display and obscures the battery making for a better display.

    I've looked at most of the mass-produced "geek" watches and retro LED watches (ok so I did buy a Zeon) but most of them look and feel cheap. And there is nothing special about their design or function.

    This watch is like an expensive two-seat sports car and can be appreciated as such. You take it out on the weekends for a fun. You don't take it to work everyday.

  27. Re:Better site, and cool photo: by Cyclotron_Boy · · Score: 3, Informative

    Hate to self-promote, but here's my website with the nixie tube clock I was selling (before I ran out of parts). The most informative webpage for nixie tube related stuff is actually the Yahoo NeoNixie group, at Yahoo Groups. David Forbes, who designed the watch, is a regular contributor to the list, and is a great guy- very knowledgeable. I have learned a lot from the list, and I highly suggest joining the group to anyone even remotely interested in the technology.

  28. Re:Retro-future cool by parasonic · · Score: 2, Informative

    LED watches are actually more energy efficient than Nixie tubes. A Nixie tube *IS* a CRT. So my watch battery lasts months even.