Build A Nixie Tube Clock 126
J Aldridge writes: "People are still using Nixie tubes. Their warm glow seems to be the digital equivalent of the warm sound of vacuum amplifiers. One person has constructed a tube wristwatch."
How many NASA managers does it take to screw in a lightbulb? "That's a known problem... don't worry about it."
Pixie tubes (Score:1, Funny)
Mmmm (Score:1, Interesting)
Re:Mmmm (Score:3, Insightful)
When can I have one?
Re:Mmmm (Score:3, Interesting)
I have a Casio Mini (Casio's first handheld electronic calculator) that has 6 x 7 segment VFD displays. The tubes are seperate, perfect for H:M:S.
This calc is interesting as it has a fixed decimal point not shown on the display and is not capable of user entry of a decimal point.
Good condition with a slight dent and little corrosion on battery terminals. It's up for sale if anyone is interested in it or it's small tubes? Collectors item and I'm not a collector of old calcs (I prefer my 48GX).
shanep AT ign DOT com DOT au
hey (Score:2, Funny)
Re:hey (Score:1)
Um, try 70's.
confusion... (Score:1)
after reading the blurb... "people are still using these things..." i just thought... ok. that's nice to know.
Re:confusion... (Score:1)
you know, I'm tempted to build one those look kinda cool
Beware of following the instructions on this page (Score:4, Informative)
Although web archive's archives of the Repair FAQ only go back to 15 Feb 2K1 [archive.org], if I remember correctly the removed link went to the page Slashdot is linking too. Word from the wise: I'm not saying Nixies are inheirently dangerous, but many schmatics involving Nixie tubes do not isolate from the power line. And don't forget the big red warning on the page:
Re:Beware of following the instructions on this pa (Score:1)
Re:Beware of following the instructions on this pa (Score:2, Interesting)
http://margo.student.utwente.nl/el/misc/text_cir/
Warning, this circuit Really Is Dangerous.
And pissing into (Score:1)
Re:And pissing into (Score:2)
There is a big difference between a switching power supply designed by real engineers, with UL/CSA/TUV review and approval, and some random electronics project. Isolation transformers are a must for any electronic device that someone is going to poke around in with their bare hands.
Re:And pissing into (Score:1)
I work for a company that made bucketloads of cash reworking real IBM XT power supplies because while they were rated at 220/240VAC, their caps blew because someone at IBM forgot at 1.414x240+/-10% was. Can you say opps.
And you might want to check to see just what it takes to get that UL/CSA/TUV rubber stamp of approval.
Re:And pissing into (Score:2)
Re:And pissing into (Score:1)
If you are going to routinely put 375 volts into a device, it should not have a large number of components that exceed their ratings once the mains voltage exceeds 340. Things that can break down are caps (which have been known to catch fire, vent and genenly smell bad), wire insulation which can result in shorts, transformer insulation that can cause the windings to have less resistance, various types of surge proection devices that will attempt to trip 50 times a second.
I've seen UL and TUV stamps of approval on lots of things for the Australian market based on testing at 220V. Sorry but Australia uses 240V and in places thats +/- 20%
Re:Beware of following the instructions on this pa (Score:3, Insightful)
All TV sets and computer monitors are this way too.
If you work with the stuff it's a good idea to have an isolation transformer around (I've misplaced mine) There is a lot of High Voltage stuff in electronics. Know what you are dealing with, take all the right precautions, and hold one hand behind your back.
Re:Beware of following the instructions on this pa (Score:2, Informative)
(NOTE: Holding one hand behind one's back and wearing rubber-soled shoes is to prevent the current from getting a path across one's heart)
Re:Beware of following the instructions on this pa (Score:3, Insightful)
When I was 17 (before I'd been taught all that), I was helping a friend hook up an electric fence. The transformer had a wing nut on each side as a terminal, and was mounted to the wall by a nail at the top. For some IDIOTIC reason, I was trying to hook the fence up plugged in. Now, you often do have to work on live electrical equipment, but this was clearly not one of those cases.
So, in any event, I hooked up one lead, and was tightning the wing nut for one lead. Of course, since the transformer was hung from a single point, it was flopping around. Without even thinking about it (a lot of not thinking going on, that day), I swung up my left hand to stabalize the transformer... And grabbed the oposite terminal.
I remember standing there, with the muscles in my arms convulsing, and I thought, "I've got to do something." My chosen course of action was to yell "SHIIIIITTT!" at the top of my lungs. It didn't seem to improve my situation any, so I thought for a bit on what might be more productive. In one convulsive movement, I threw myself away from the transformer (my hands were locked to it by muscle spasms from the current).
So, children, that is why you should grab your belt with one hand, and hang on for dear life.
TV and monitor power supplies (Score:5, Insightful)
First, the incoming AC is rectified to DC and filtered. This gives you 300VDC on about 10 to 1000 microfarads of capacitance - enough to kill you dead if it goes through your chest. That part of the circuit is directly connected to the power line.
Then the DC is chopped by a transistor and fed into a transformer (this is the "switching" part of the power supply). This chopping is done at between 60 kHz and 1 MHz (depending upon the power supply). The other side of the transformer (the secondary) is completely isolated from the power line. This voltage is then rectified, filtered, and supplied to the rest of the device. The voltage is measured, and fed back to the switching controller, which drives the switching transistor through either an optocoupler or pulse transformer, closing the feedback loop and regulating the voltage.
If you look at a modern switcher, you will usually see the "hot" side is completely isolated - even unto having sections of the PCB cut to prevent arc-over.
So, the bulk of the power supply, and the rest of the chassis, are NOT electrically connected to the power line. In fact, less of the system is connected to the power line than in an old style line frequency tranformer design. (Now, there were some old designs that rectified the power line and used that directly. THOSE designs were "hot" chassis designs, and were widowmakers...)
That said, you shouldn't go poking around inside a monitor or TV unless you know what you are doing. The anode voltage on the CRT is between 12kV and 25kV (although the source impedance is high enough that it won't kill you). However, the deflection circuits that sweep the electron beam across the CRT are at about 400V and have enough energy to knock you on your ass.
I've worked on TVs, monitors, radio transmitters (including tube based 250 watt repeaters (3kV at
Re:TV and monitor power supplies (Score:2)
How can you chop DC at any frequency? DC current has no frequency. And transformers only work on alternating current; it just makes a big electromagnet if you run DC through a transformer (and no current comes out the other side, except when you first apply the DC then again when you turn it off).
What am I missing here? Or is it the original post that's off?
Re:TV and monitor power supplies (Score:2)
no current comes out the other side, except when you first apply the DC then again when you turn it off
Right. Do this over and over, really fast
-
Re:TV and monitor power supplies (Score:2)
Re:TV and monitor power supplies (Score:2)
No. AC is alternating current, -AC Volts to +AC Volts. That is not quite the same as pulsed DC current.
Going back to your older post:
How can you chop DC at any frequency? DC current has no frequency.
Read "chop" as "cut off". You can cut off DC current and turn it back on a number of times per second. That is the frequency. You get (ideally) a square wave between 0 Volts and +DC Volts.
transformers only work on alternating current
Transformers work on any change in current.
-
Re:TV and monitor power supplies (Score:2)
But my biggest stumbling block was not knowing what 'chopping' DC meant.
Thanks!
Chopping DC (Score:1)
"Chopping" refers to turning the DC on and off so as to generate an alternating current that can be used in transformers. Modern power supplies do it the way described because higher frequencies allow smaller and lighter transformers for the same power level. Older-style, mains-frequency transformers are big and heavy, and aren't efficient -- largely because the low frequency means they need iron, and the iron has hysteresis and other losses.
Really small, cheap, low-power power supplies don't even use transformers any more. They use capacitors and diodes in voltage-doubler circuits.
Regards,
Ric
Re:Chopping DC (Score:2)
Thanks much!
cool clocks (Score:5, Interesting)
(Be sure to check out the Story Teller [wps.com] if you go to that site - extremely cool!)
Forgot one thing... (Score:3, Informative)
There is a good background writeup on nixie tubes here [wps.com] on part of the WPS site.
Please don't bother moderating this up - it's at a high enough level that people will see it, and I've been at the cap for quite a while.
(now, if someone were to flip my rtbl [slashdot.org] flag I'd be thankful...
Reminiscent.. (Score:3, Interesting)
just what I needed to spruce up the shop (Score:1)
But where the hell would I get Nixie tubes if I don't happen to have any in the attic (I looked).
Re:just what I needed to spruce up the shop (Score:1)
that or just pester all your friends, that *almost* always works for finding ancient comodity parts
Re:just what I needed to spruce up the shop (Score:1)
Great! (Score:2)
Damn you slashdot!
-Restil
Re:Great! (Score:1)
Damn you slashdot! :)
I know the feeling. I currently have to many half [nerdvest.com] finished [nerdvest.com] projects [nerdvest.com] on the plate.
Warning from site (Score:2, Interesting)
If you need to use an oscilloscope for debugging, the circuit MUST be operated through an isolating transformer."
As cool as this looks (yet still too much for me to tinker with), just this warning would put me off. One small error at 340V could be an, ahh, inconvience! And I didn't see any mention of what type of currents are running. Crispy!
But seriously, having the rough equivalent of neon tubes for "UK£10/US$15 (excluding nixies)" would be neat. But considering that my lab group for EE201 blew out every circuit/component we tried to build in lab, I wouldn't trust myself with a soldering iron on anything more dangerous than an unplugged PCB board.
Re:Warning from site (Score:2)
This reminds me of a Heathkit oscilliscope kit I put together 20 years ago. The beam intensity control circuit used a normal TTL gate chip that was attached to the back of the tube. The chip's power and ground were connected between -2000 and -2005 volts(!).
It the input signal to the chip (which was always pulsing to cancel DC potential) was controlled by the rest of the circuitry at between 0 and 5 volts, and this was transferred to the control chip via a huge high-voltage rated capacitor with 2000 volts accross it, which would wiggle the other end between -2000 and -2005 volts. An impressive hardware hack.
As it happened, when I finished the scope and fired it up, it didn't work. It was pretty hard to debug without an oscilliscope :-/, and I was afraid of shocking the crap out of myself poking around 2000V circuits. I eventually got it working. It still works to this day, but the lame 5MHz bandwidth isn't too impressive.
Darn it. (Score:2)
Another new hobbie vanquished by the Slashdot Effect.
Coincidence. (Score:2, Interesting)
Of all the obscure things to hit me twice in one day!
A friend of mine has a page up detailing exactly this. [ihug.co.nz]
He's a valve lover, not a web designer, but he has lots of pictures, and would love feedback!
His main page is here. [ihug.co.nz]
Re:Coincidence. (Score:1)
It was dubbed "the floorshaker" and was one of his first forays into valve technology about 8ish years ago. Our band used it.
Now he builds very nice, audiophile quality valve amps for home theatre.
He's going back to university to study hardcore, so I doubt this will turn commercial!
Warm Memories (Score:2, Insightful)
I could tell that even then it was something special by the way he treated it and obviously treasured it. It wasn't until I was older that I learned to appreciate the tech of yesteryear and the creativity and genius of those who created so much with the limited tools they had at the time.
Re:Warm Memories (Score:1)
190 volts at... (Score:3, Informative)
I seem to remember: 190 volts minimum at 3 to 5 milliamps. Discouraging if you want to use batteries.
Liquid Crystal Displays: A few volts at almost zero milliamps. If you had designed with Nixies, the discovery of LCDs was like God was giving us a gift.
Re:190 volts at... (Score:5, Informative)
Big whoop. It's not hard to make a switching power supply [smpstech.com] that will give you whatever voltage you want from a battery supply. Lots of sample circuits are out there.
You can also buy inexpensive inverter modules that make 100VAC from a battery supply - typically used for powering LCD electroluminescent backlights. Seach on digikey [digikey.com] for "backlight inverter".
It can SOURCE that, but for how LONG? (Score:3, Informative)
I don't believe that he was saying that it was impossible or that someone didn't do it- it was just a godsend for the people having to develop devices with numeric displays to not have to mess with Nixies.
Bong! (Score:1)
Re:Bong! (Score:1)
Oh great, they just got n Times harder to find now (Score:1)
*sigh*
Re:Oh great, they just got n Times harder to find (Score:1)
The coolest comes here (Score:1)
Nixie-Chronometer 01 [uhrenliteratur.de]
Gee, sounds about as useful as a... (Score:3, Funny)
Oh wait, that did end up being kind of useful
Hurray for old tube things.
Anyone actually selling nixie clocks? (Score:2, Informative)
Re:Anyone actually selling nixie clocks? (Score:1)
Re:Anyone actually selling nixie clocks? (Score:1)
Still have some ofthose tubes... (Score:2, Insightful)
Projects already on the back burner:
Dynakit STA-35 amp
Pioneer vacuum tube receiver (needs some small caps replaced)
Still enjoy my old Ampeg V7 tube amp, too. Digital circuits seem to take extreme proportions to replicate the functions of the simplest old analog circuits. Not alway for the better, either.
I think I'll make one... (Score:1)
Even Cooler... (Score:5, Interesting)
However, while browsing some of the associated links, I came across this clock, which I find even cooler:
http://www.cathodecorner.com/ [cathodecorner.com]
It uses an oscilloscope tube to draw the time in green phosphor arcs - no pixels. Way cool! And a kit is available with a guts-on-display plexiglass case. Awesome...
--Jim
Re:Even Cooler... (Score:4, Interesting)
Very nice!
If you don't feel like figuring out how to drive a CRT directly, there are some interesting things you can do with just a regular oscilloscope set to XY mode. Next time you're at Fry's, go to the aisle where they have all the oscilloscopes and function generators. This works best on a CRT scope, not a digital sampling scope. Hook two function generators to the scope inputs and set it to XY mode. Set the function generators to a sine wave, and play with the frequencies. You can generate all sorts of interesting lissajous figures [math.com].
I once made a project using a PIC, a couple of DACs, and two stepper motors. The stepper motors were wired up like a "poor man's galvanometer" - the were driven by the DACs to move back and forth within a step. By mounting the motors at 90 degrees and hitting them with a laser pointer, I was able to make a pretty groovy portable laser show for about $40 worth of components.
Another thing you can do if you don't feel like making your own hardware is to hook your sound card's left and right outputs to an oscilloscope. The you could write some simple software to draw these kinds of figures on the scope by just sending the wave forms out of your sound card. Unfortunately the frequency response is limited to the audible range so this is not ideal. A simple resistor-ladder DAC on the parallel port might work better because you could have <20HZ frequencies.
It's amazing what you can do with a little geometry....
Re:Even Cooler... (Score:2)
You don't even need a scope to do this kind of thing. When I was 16 or 17, I learned how to disconnect the yoke from a TV and connect the inputs to other sources - a poor man's X/Y scope. One time a friend and I connected the horizontal and vertical yokes to the left and right outputs of his stereo's B speaker channel and made all sorts of cool patterns while we played Aerosmith until our ears bled. There must have been some horrible kind of impedance mismatch, though, because after a couple of hours, we completely burnt out his expensive high-power amp. Oops.
Another time, while my girlfriend's parents were in Europe, we reversed the connection to their TV's vertical yoke coil to turn the picture upside down. We were going to leave it that way for her parents to discover, and thought they would find that hysterically funny. But when we realized they probably wouldn't figure out how to fix it, and that they'd probably spend a bunch of money on a TV repairman, we chickened out and put the picture back right-side up. Instead we turned upside down the abstract metal sculpture that hung above their fireplace.
--Jim
Re:Even Cooler... (Score:2, Interesting)
One of my most prized posessions in college was an old B&W TV with 8 ohm vertical and horizontal coils.
By FAR the coolest patterns were produced by Dire Straits from the Brothers in Arms LP - especially the song Telegraph Road. I still think it was all the pot smoke that eventually burned out my stereo, not the boob tube.
At some point, I could actually look at the boob tube's patterns and identify what song was playing - I shite thee not!
Re:Even Cooler... (Score:1)
Telegraph Road was on Love Over Gold. Great album, though. Hmmm... I've got an ancient 13" B&W TV... Hmmm... I wonder...
--Jim
Re:Even Cooler... (Score:1)
It had a single row of LEDs, mounted along a pendulum. The pendulum would swing back and forth, and the LEDs would flash so as to make it look like the current time was 'hanging' in the air in front of you.
Kind of like the way monitors work [howstuffworks.com], I guess, except with a very low refresh rate.
You can rig one up with your parallel port [lvr.com] (I think parallel ports can just put out enough current to drive LEDs, but you might blow your port outputs if you're not careful); get it to output a fixed sequence at a certain frequency and wave a bit of wood with your LEDs mounted on it back and forth, and you should see a nice pattern.
I had a friend who was doing this, but I have no idea if he got it going or not.
Re:Even Cooler... (Score:2)
An electronics store here has this kind of clock, except the "pendulum" is inverted and motor driven. It scans back and forth very fast, and the red LED characters really seem to be hanging in midair. It's programmable and can be made to display the time and a short custom message. Pretty cool for $99 or thereabouts. I'm pretty sure Slashdot has covered this kind of gadget in the past.
--Jim
Woohoo! (Score:3, Funny)
Try Jaycar Electronics if you're in Australia ... (Score:2, Informative)
If you're lucky, this link [webfactory.com.au] will take you to the description (and might even give you my session cookie
The one you're after is '11 Digit Fluoro Bargain'. Here are the details:
Only A$1.70 each - about US$1.20 or so. I got two of them a couple of years back. Needless to say, they're still sitting in the cupboard, waiting for me to get around to making something with them
Pinball Machines (Score:2)
Re:Pinball Machines (Score:1)
Re:Pinball Machines (Score:2, Interesting)
They're kind of interesting in that they're nothing more than complex neon lamps. They consist of metal segments, laid out in the pattern of a seven or fifteen-segment display, sealed in a glass enclosure that contains (of course) neon. Apply about +130VDC to the common anode, and then ground the appropriate lead for the segment that you want to light up.
I don't see them much any more, at least not in pinball machines. The reason, I think, is that PanaPlex displays did not stand up to vibration and shock particularly well, and pinball machines dispense both in generous quantity.
For trivia buffs: There was one other type of vacuum display tube made that consisted of individual incandescent filaments, in the familiar seven-segment pattern, sealed into what looked for all the world like a standard miniature tube envelope. I don't recall who made them, but their trade name was 'Numitron.'
Anyone remember any more about them? The BART system in the Bay Area (California) had loads of them in their old ticket machines and other digital readouts, such as those used on the station agent consoles.
Re:Pinball Machines (Score:1)
Re:Pinball Machines (Score:2)
You mean like the last of the old TV sets with knobs that you turn to change the channel? Rather than having the numbers on the knobs, there was a wheel with the numbers on it, and the channel you were on showed in a small window, illuminated from behind by an incandescent light. Now that I think of it, that might have been my first ever electronic personalization (analogous to a case mod), when the incandescent lamp went out, I found a green neon lamp to install in its place.
Re:Pinball Machines (Score:1)
Design considerations (Score:2, Interesting)
Re:Design considerations (Score:5, Interesting)
Frequency (Score:2, Interesting)
When a large load is applied to the grid, the frequency drops slightly and all generators in Europe deliver extra power to compensate for this (i.e. keep the frequency at 50 Hz), this is called frequency compensation.
If the load persists longer, the plant/country/company responsible for the load increases its power output (thereby raising its frequency) to make sure the cost of this load is directed to the proper plant (power compensation).
Due to the inertia of the entire European powergrid most of these frequency changes are no more than microHertzes, even when applying loads of megawatts.
Just putting my "Process control in high-power electrical systems" course to use, I'm not an enormous expert in this field, and this course was a few years ago (my field is optical communications)..
Re:Frequency (Score:1)
A small power company where I useto live accidentally connected up a generator out of phase. They retreived the alternator core from the basement of a building over a half mile away. Thankfully no one was hurt. That was only a 1 Mega Watt generator. It weighed a few tons. Before it had left the power plant it had sheared off a 10 inch drive shaft and cracked the case on a huge diesel engine. The remains of the strator housing destroyed the generators on both side of it.
Re:Frequency (Score:1)
Re:Design considerations (Score:2)
Sorry, I'm a software guy...
Instead of a clock (Score:1)
Home made A/D - basically an op-amp integrator which ramped up to the voltage to be measured, whilst the Nixie tubes counted up time.
Yeah, sure, it took a hell of a lot of calibration to get any accuracy out of the thing, but the boxfull of 0.1% resistors I'd "acquired" from somewhere helped a lot.
And hooked into a couple of amplifiers in my (analogue) computer I could measure currents in the single figures of microamps - rather better than my moving coil meter could manage.
nixies--where they came from (Score:4, Interesting)
cold-cathode gas display devices before WWII.
National Union made such numeric displays around 1940,
the GI series tubes used bent wires to form numerals and
had large 9-pin bases.
The Haydu Brothers Co. developed what we call Nixies today
circa 1947/48--
Burroughs bought the Haydus out in 1952, making all their
display tubes (and their complex "Trochotron" counter tubes)
into Burroughs products. After Burroughs
was absorbed by Unisys, tube manufacture ceased--however,
companies such as Richardson/National and Philips were making
Nixies well into the 1980s. Richardson still has the special
tooling to make them, and could make more if demand
appears. Prices for NOS Nixies are rising, because so many people
are building clocks and fooling with old test equipment....
--Eric Barbour
VACUUM TUBE VALLEY magazine
(www.vacuumtube.com)
Nixie Tubes (Score:1)
rm -r windows
Where to buy one of these clocks (memepool repost) (Score:1)
And personally, I think the combination of 30-year old Nixie tubes and modern PIC16F84 microcontrolers is simultaneously creepy and wonderful.
Nixie Datasheets, sources, etc... (Score:1)
Should've used a real power supply... (Score:1)
It would not have been hard to design a proper power supply for that clock. In fact, I question the designer's wisdom, maybe even their competence, in not going with said supply. Transformerless designs, I thought, went out with the old tube-type clock radios.
For those that are thinking of making the thing, I'd strongly suggest doing it right. You'll probably need a couple of amps worth of 5V, and the tubes should run on anything from +130-170VDC.
If you can't find an appropriate transformer that contains the requisite HV winding, try using two transformers: One for the low-V stuff, and the other being, say, a 12V filament transformer, wired such that the secondary winding is hooked to a 12V winding on the first transformer. The step-up effect should be enough to drive your tubes (you don't need a lot of current for Nixies).
Re:Should've used a real power supply... I DID! (Score:1)
Back in my day... (Score:1)
My first computer work was as an operator on a Burroughs B-4700... the front panel had 8 (I think) nixies and a keypad to enter machine instructions. Most of the time, it was to enter the instructions to read the bootstrap deck from the card reader for a coldstart. If the mainframe crashed, that was where you could debug, etc. In later models, the bootstrap level was moved to the console, which had a cpu, 8" floppy and a CRT.
Later, I went to work for Burroughs Corp at their large systems manufacturing plant. I was around when Burroughs aquired (read: bet the farm) Sperry Univac under CEO and former Treasury Sect W Michael Bluementhau creating Unisys. As I recall, nixie technology has not been used in any new (B) products since 1980-1981 - they probably kept manufacturing a few years for spares, etc.
I love the clock idea - sounds like a cool project.
Case Mod (Score:1)
Two strange Nixie Tube Devices (Score:2, Insightful)
Another fellow employee built a Nixie tube clock, but it used a 3-foot long glass PENDULUM as the rate determining device. A photodetector sensed the passing of the pendulum, incrementing the clock counters and sending a pulse to a coil to give the pendulum a "kick" to keep it going. It was an amusing mixture of old and new (at that time) technology.
Re:Two strange Nixie Tube Devices (Score:1)
Display technologies, clocks, associated crapola (Score:4, Interesting)
Pretty much all instrumentation these days looks the same, membrane switch, LCDs, a few LEDs, a pile of nifty software, an order-of-magnitude more accurate than the previous model, runs on a AA cell for 2 years until you throw it out.
However, our lovely bodies are physical, and they like being enticed with 'interface' (sic) that connects with more than just yore brane. You can *touch* nixies, the glass is nice to touch, and so are heavy bakelite knobs, switches you can *feel* change state.... Nixie digits jump around. The orange color works well with your eyes. There's no blinky multiplex updates to dazzle.
In general, pre-photomicrolithography electronic stuff was more fun to touch and use (though largely sucked when it came to power consumption, reliability, size, heat output, portability, ad nauseum) as is quite obvious.
A Tektronix scope is an excellent example of technology and interface design and of paradigms lost -- they use first-principle physics (the cathode ray tube is more than just a display, it's an integral measurement component), a mixture of solid-state and state-of-the-art electron tubes, analog computing components (verniers), big clicky knobs, coded by color, size, shape and placement, nice colors and shape, a manual that contains data and meta-data (operating, maintenance, design! and curious gratuitous cartoon graphic characters walking along signal paths...) Like other targetd instrumentation, it embodied and defined a culture of use that was far more
But performance-wise, my TDS-220 software'n'LCD 100MHz BW gigasample scope, the size of an old table radio, is incomparable. It's a pretty amazing contrast for only 30 years of development.
But now we get the best of both worlds (sic), teensy micros under the nice part of the old stuff. I think it's a pretty normal development, culturally, this re-use of the "outsides" of old equipment to achieve a revisionist view.
Interface is always where the interesting stuff is.
The best nixie and 'scope clock technology out there today, is hands-down, David's (http://www.cathodecorner.com), surface mount, AC power line isolation, small, low-power, software driven, switcher HV supply, reasonable price (no I get no kickback frmo his sales).
I wrote a brief history of nixie and decimal tube history here: http://wps.com/texts/decimal-tubes/index.html, nothing exhaustive, but a good start.
For home-brew, a transformer/diode bridge/series regulator with zener is somewhat crude, but easy to make, reliable, and reasonably low power. For a transformer I use a Thordarson-Meissner # 26R60 transformer from Allied Electronics (web order) around $19 each (provides 6.3V and 150V outputs). This is no where near as elegant as David's but for one-off it's fine.
I too make clocks (http://wps.com/products) but I'm not in the clock business per se, mine are simply art (more accurately craft) objects, though I'll make more. My emphasis is more on a functional, tactile artifact, a Nice Thing to hold and use. I've only made a half dozen so far, I've got another half-dozen in the works. After I use up my stock of PCBs I'll end up buying guts from David, it's a much better design.
I purchased a Nixie Tube Multimeter last year... (Score:2)
I took it out and plugged it in. It didn't work. I then got curious and took it apart to find a fuse blown. I replaced it and it lit up like a brand new multimeter.
There is something about the 3-Dimensionality of it. The numbers that it comes up with literally jump out at you or jump away from you. It's soo cool...even if its got a beige plastic case.
Unfortunately people at work didn't share my admiration for it(Something about being out of date). I had to take home here where it commands a distinguished place on my bookshelf.
how about a.... (Score:1)
Now i know that there are TRUE small nixies out there for i've seen them in a old medical diagonstic display (a hemocrit counter to be exact) not just a modded vacuum flourescent display.
Or a non-nixie, tube digital clock (Score:1)
http://www.mindspring.com/~jforbes2/tubeclock/cloc k.html
jim
Re:Bah. (Score:1)
Re:wristwatch! (Score:1)