[neonixie-l] Nixie tubes for sale - lots of small tubes

offers, I don't know what the market for bulk American style tubes is like these days, and I'd hate to give 10% to eBay. I'll also take offers on ~50 of my round Nixie watch kits, partially or fully assembled. -- David Forbes Tucson, AZ -- You received this message because you are

Re: [neonixie-l] Scope clock STM32

rather than rolling your own graphics. That's a nice standard solution that makes sense in this age. On 2/26/2024 2:12 AM, paulvr wrote: This is my first post in this forum and I would like to introduce you to my version of the scope clock. Mainly inspired by the work of David Forbes and Grahame

Re: [neonixie-l] CRT - heater connected to cathode - 6.3V AC or DC

another post. > > I have built a Scope Clock based on David Forbes design. I hand wound the > transformer. > > All secondaries, including for the heater are on the same core, so the > voltage for the heather output depends on duty ratio, frequency and load on > the other sec

Re: [neonixie-l] ScopeClock with teensy4.0

realised that > Teensy 3.6 is impossible to get... > > Il giorno sabato 11 marzo 2023 alle 18:41:05 UTC SD ha scritto: > >> David Forbes has the schematic on his website, and the firmware on >> Github. I did not see that Jörg was making kits, in fact he said he didn't >> wa

[neonixie-l] Surplus electronics stores in Austin or San Antonio TX

Hi. I'll be there soon. Are there any interesting places to find old electronics? -- David -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to

[neonixie-l] Nixie car gauges

I built a Nixie tube instrument panel for my Corvair a couple of years ago. It's a big PC board with a couple dozen 4998 and 5870 tubes, with a separate control box. It worked very well (no vibration problems or anything), so I transferred it into my Volvo 544 shortly after I reacquired the car

Re: [neonixie-l] Anyone who has made a Nixie watch, what microcontroller and tube driver did you use?

I used a PIC 16F microcontroller, and two TD62083 octal Darlington arrays. Unfortunately, that part is no longer available, and its successor the TBD62083 is not currently available in the smallest TSSOP package. On Sat, May 6, 2023, 1:35 PM Zachary wrote: > I am planning on building a watch

Re: [neonixie-l] Babcock SP-252 Data Sheet

I have read much more garbled schematics. Zoom! Enhance! But seriously, print it out on a big piece of paper and it should be more obvious. Trace over the broken lines to see which one goes where. Make your own CAD layout, print it actual size, poke the device pins through it on some foam to

Re: [neonixie-l] Battery-powered Nixie clock?

I have made a lot of Nixie watches. The battery life depends on how often the display is activated, and the operating current of the tubes. You can use an Arduino if you turn it off when not displaying the time, and have a DS3231 or similar RTC chip to keep time. You can rig a pushbutton and a

Re: [neonixie-l] ScopeClock with teensy4.0

pic. > > I've put some effort in using the teensy4.x to run the scope clock based > on david forbes one. > The teensy3.6 based one is running on my own hardware for a while. > > But because of CPU shortage and the use of the teensy3.6 internal DAC's, I > was curious to get

Re: [neonixie-l] Rodan CD27 clock

How many football fields long is that clock? Your pictures don't show the scale On Fri, Feb 10, 2023, 5:59 PM Paul Andrews wrote: > I’ve been slowly making clocks for my stock of Nixie tubes. Thought you > guys might be interested in a quick write up I posted for a clock I made > using CD27

Re: [neonixie-l] Scope Clocks are available again

They're available now! I can make a dozen more with my current supplies. On Fri, Dec 30, 2022, 12:00 PM John DeArmond wrote: > > > > > >> On Saturday, 17 December 2022 at 21:55:35 UTC+1 J Forbes wrote: > >> > >> They're all gone > > Do you think you might do another run anytime soon?

Re: [neonixie-l] Why Nixies came before Numitrons

The Nixie can easily be driven by a high voltage, high impedance vacuum tube logic circuit. The Numitron needs a high current, therefore a transistor, for each segment, as well as a more complex decoder gate tree. On Sun, Dec 25, 2022, 9:03 AM Robert wrote: > I would have thought the Numitron

Re: [neonixie-l] hello im wondering if anyoe knows where i can find more about the NL-989

Yes, these symbol tubes are rare. Dieter's page shows a tube with an HP part number in addition to the National number, indicating that it may have been designed for an HP meter. So it's not surprising that datasheets aren't available. On Wed, Dec 21, 2022, 10:50 AM Jasper nagle wrote: > i

[neonixie-l] Scope Clocks are available again

After a long year of not making any due to supply chain issues, I have finally restarted production of my Cathode Corner Scope Clocks, in both kit and assembled form. It's available at my website... https://scopeclock.com/products/scope-clock-in-clear-plastic-case Enjoy. -- You received this

Re: [neonixie-l] Jeff's Nixie watch parts layout or schematic?

Thanks for posting this! It's not everything needed to figure out the parts placement, but the schematic diagram is a big step forward. Good photos or scans of both sides of the bare PC board are needed to figure out which parts go where. On Mon, Dec 12, 2022 at 7:47 PM Thugwold wrote: > Long

Re: [neonixie-l] Jeff's Nixie watch parts layout or schematic?

Rob, I looked around some more, and I found the Mike Harrison schematic from the year 2000 upon which Jeff based his design. It has a different timebase and power supply, but the clock and time setting logic with the 4017 chips should be the same. If you send clear photos or scans of the blank PC

Re: [neonixie-l] Jeff's Nixie watch parts layout or schematic?

Rob Sorry for not getting back to you sooner. Our telescope startup has been a real bear this year. I looked for data files for the Jeff Thomas watch, but didn't find any, either in my disk archives or my manila folders. I could probably make that watch run, given the board, the parts and some

Re: [neonixie-l] Looking for Information about "Digicator" incandescent readouts

I have some data sheets. I'll see if I can scan them this weekend. On Sat, Nov 5, 2022, 1:47 AM Dieter Waechter wrote: > Hi, > does anyone have information about "Digicator" incandescent readouts > made by Discon Coroporation? > Datasheets maybe? > See ad attached. > Best regards > Dieter > >

Re: [neonixie-l] NL-6844A

They had a short lifetime so they got replaced earlier in the lifetime of the product. In some cases the dead tubes were put into the boxes of their replacement tubes instead of being thrown out like they should have been. At least that's the conclusion I came to when buying thrm on eBay 20 years

Re: [neonixie-l] Scope Clock - HF transformer dirving circuit and PCB layout evaluation

Hi. I am certain that my scope clock designs were some of your inspiration. However, it is impossible to see what your circuit looks like because the schematic diagram does not show the transformer windings, and none of the transistors are shown as transistor symbols. Also none of the chips are

Re: [neonixie-l] What were 3L01I CRT's used for ?

I have a bunch of 1DP1 and 1EP1 CRTs. They are also rather small, being 23mm and 30mm respectively. They were used as signal monitors in test and communications equipment. On Thu, Sep 8, 2022, 1:20 PM gregebert wrote: > I bought a dozen of these a few years ago for a future project, and I've >

Re: [neonixie-l] Jeff's Nixie watch parts layout or schematic?

I think I have that information on my home computer. I'll be home Friday. On Mon, Aug 29, 2022, 7:09 PM Rob Bailey wrote: > Ages ago, I purchased Jeff's Krusty Klown nixie watch kit [two, in fact]: > > http://www.nixie.dk/~jthomas/watch.html > > Of all parts of a kit to lose, I lost the

Re: [neonixie-l] Is there any merit to the claim that ceramic tube sockets crack tube pins?

Back in the good old days when sockets were made by military suppliers, they were designed well and made according to all the design details. Later, these good sockets got copied by manufacturers who didn't understand what details to copy, so they got progressively worse over the years. Fast

Re: [neonixie-l] How do I install tubes with wire leads?

I have installed thousands of Nixie tubes with wire leads into sockets. The first step is to use tweezers to bend the leads so that the ends are where they need to be to plug into the socket. I usually do this using the plastic lead spacer as a guide. I cut the leads just enough longer than the

Re: [neonixie-l] FS: 5 NOS 5870

just popped the back off a c.1960 five tube radio made by Monarch in Japan, and it is full of Matsushita tubes.) It's an interesting question. On Sat, Aug 20, 2022, 5:15 PM Charles MacDonald wrote: > On 2022-08-20 14:25, David Forbes wrote: > > Max, > > Thanks for the photo.

Re: [neonixie-l] FS: 5 NOS 5870

Max, Thanks for the photo. These JRC tubes look very similar to Japanese Burroughs B-5870 tubes. It's likely they were made in the same factory, but I don't know whose factory it was. On Fri, Aug 19, 2022, 3:19 PM Max DN wrote: > David, > > see attached a picture of the B-5870 by JRC. > > John

Re: [neonixie-l] HVPS in parallel

I would hope that your power supplies have regulated voltage, correct? Therefore they should both be the same voltage, within the tolerance of the voltage determining components, if the supply design has good load regulation. In the worst case, provide a voltage trimmer on one supply so that you

Re: [neonixie-l] Re: Nixie Clock - Direct Drive HV5530

The most sensible low-cost direct drive arrangement in terms of parts count and board layout is SOIC 74HC595 shift registers and SN75468 HV driver arrays. There's a Chinese Zirrfa 6 digit clock board that uses this approach. On Mon, Aug 15, 2022, 7:09 AM David Pye wrote: > Given the price of

Re: [neonixie-l] FS: 5 NOS 5870

John, I'd love to see a photo of those tubes. I've been through thousands of 5870 tubes, but I've never seen a JRC tube. On Mon, Aug 8, 2022, 9:09 AM John wrote: > I have 5 NOS JRC branded B-5870 nixies for sale. I am asking $100 > postpaid in US. Price is a guess as I can't find reference

Re: [neonixie-l] Ceramic output capacitors on MAX1771 converter?

I haven't tried it, but I can make some observations. The MAX1771 isn't connected directly to the output circuit, so it's not likely to suffer from a problem. The current flows through the inductor which will accommodate a momentary short circuit caused by the capacitor. In short, it shouldn't be

Re: [neonixie-l] 6 B-7971

That's the best price I've seen for those tubes in a lng time. Oh, wait... On Thu, Apr 28, 2022, 10:03 AM Michail Wilson wrote: > I thought people would get a kick out of this auction. Especially those > of us whom are always searching for MOD-6 Clocks or 6 tubes of B-7971 > > > >

Re: [neonixie-l] RARE VINTAGE CLOCK, WATCH, JEWELERS TIMING, CALIBRATION MACHINE WITH NIXIE TUBES

I findit amusing that a precision watch timing instrument has a 4 digit display. On Tue, Apr 12, 2022, 7:55 PM Nicholas Stock wrote: > No idea what this is, but pretty interesting! > > > Look at this on eBay > RARE VINTAGE CLOCK, WATCH, JEWELERS TIMING, CALIBRATION MACHINE WITH NIXIE > TUBES >

Re: [neonixie-l] New to arduino and nixie projects, looking for advice

I built a Nixie tube instrument cluster with speedometer etc. for my Corvair last summer. I used many 74HC595 shift registers to send all the tube cathode data out via SPI. Then I used TBD62083 octal high voltage driver arrays to run the tubes. I'll send you the design files if you're interested.

Re: [neonixie-l] OT: CRT timing question

Jens, The CRT monitor may not be adjusted properly. The horizontal oscillator probably has a frequency control. This what we called Horizontal Hold on TV sets. Do you have any documentation such as a schematic, service manual or similar for it? On Fri, Feb 25, 2022, 9:34 PM jb-electronics

Re: [neonixie-l] OT: CRT timing question

g. But the > absoltue value of the pixel clock should not play any role here, should it, > assuming that I calculated the correct horizontal timing? > > Best wishes > Jens > > On 2022-02-20 8:58 p.m., David Forbes wrote: > > Jens, > The horizontal line timing is incorrect. Th

Re: [neonixie-l] OT: CRT timing question

Jens, The horizontal line timing is incorrect. This is why the image is diagonal. The numbers that you provided do not specify the horizontal line total time or frequency. The monitor requires 52 microseconds or 19.2 kHz. You need to find a way to specify this, perhaps it is the character count or

Re: [neonixie-l] Burroughs / Varian-National Nixie design documents

ave a response, do you have any idea if it is > possible to access those records online or would I have to go in person or > get someone to scan a document for me? > > On Wed, Feb 2, 2022 at 8:32 PM David Forbes wrote: > >> Google has led me here more than once. It may be worth a

Re: [neonixie-l] Burroughs / Varian-National Nixie design documents

Google has led me here more than once. It may be worth a visit to poke through these records. https://archives.lib.umn.edu/repositories/3/resources/222 On Wed, Feb 2, 2022, 12:51 PM Audrey wrote: > Hey all, I'm in search of the original design documents for any Nixie > tubes, ideally the small

Re: [neonixie-l] Nixie in Video game spotted.

Well, at least a 2D representation of a Nixie tube cathode in a decidedly non-Nixie-tube housing. Similar to that ridiculous Nixie watch in Metro:Last Light with end-view tubes that's 14mm thick in total. And people want replicas of it made with real Nixie tubes. Ah, video game physics... On

Re: [neonixie-l] Querry on NL1222S and NL1222B

I don't know much about that tube, but the similar 5870 series uses the letter suffix to describe the pins and spacer plastic. On Wed, Jan 26, 2022, 6:19 AM 'Bogdan Paduraru' via neonixie-l < neonixie-l@googlegroups.com> wrote: > Dear friends , > > Does any one of you knows the difference

Re: [neonixie-l] Japanese Nixie Watch

I have one of their square watches. I also have experience repairing one of them. It had a very poor quality lead trimming and soldering job on the tubes. The square watch has a seriously dim display. You can't see it well at all in the daytime, even indoors. I suppose the huge power transformer

Re: [neonixie-l] Re: Managing RTC when there's GPS time

Bill, I went a ways down that rabbit hole in 2006, ending up with a rubidium Nixie clock. Then it subsided. These days I can get all the time nut energy needed at my day job. We run portions of the Event Horizon Telescope, which requires picosecond correlation accuracy over several continents.

[neonixie-l] Managing RTC when there's GPS time

My latest scope clock uses a DS3232 RTC chip for general timekeeping. This chip only keeps time to the nearest second, as far as the user-readable registers are concerned. I also have a USB port that can read the time from a GlobalSat GPS puck. This reports the time once a second through the

Re: [neonixie-l] Looking for a PANAPLEX display driver module

Richard, I have never, not once in my long life, seen a data sheet for, much less spare units of, modules of this sort as used in calculators. They were designed for a very specific purpose for OEM customers and not published. You could get really lucky and find them, but don't expect to. Your

Re: [neonixie-l] Cathode Corner Scope Clock is nearing production

> On Sat, Sep 4, 2021 at 7:11 PM Audrey wrote: > Wow that's amazing! Excellent work. > > On Sat, Sep 4, 2021, 10:00 PM David Forbes wrote: > Finally! I have found a way to make Scope Clocks again. > I first made them in 2001, using a plastic case fabricated locally. I > rede

Re: [neonixie-l] Utmel.com

Rather than going to dodgy vendors, I have been able to find a similar part from a different manufacturer that meets my specs and is in stock at Digikey. Is there anything in the BAT series? On Sat, Jul 24, 2021, 11:55 AM Michail Wilson wrote: > I have been trying to buy components for a

Re: [neonixie-l] High speed mosfet for High Voltage Power Supply

Max, The LT1308B has a .01 uA typical, 1 uA maximum standby current when shut down, according to the data sheet, shown on page 2 as Iq (the third line with Vshdn = 0V). I don't think you have a problem here. On 6/6/21, Max DN wrote: > Hello, > > I'm working on a solar powered nixie watch

Re: [neonixie-l] CRT clock kit instructions

I haven't been following this thread closely, but I finally looked through it this morning. It looks like this is a copy of my SC200 design from 2008. At least the components look the same in the pictures. Please send me an email at david at cathodecorner dot com, and I can help you sort it out .

Re: [neonixie-l] Re: Looking for High side and Low side driver suggestions

Richard, A single push-pull HV driver chip will not be able to drive a multiplexed display. The reason is that it only connects each tube element to either 0V or 180V. It is not capable of leaving an element disconnected. On Thu, May 20, 2021, 8:45 PM Richard Scales wrote: > Sorry, I mean

Re: [neonixie-l] Looking for High side and Low side driver suggestions

Richard, A million years ago, I designed a multiplexed Nixie clock using a 74141 cathode driver and two transistors per anode. It worked well. Here's the user manual, with the schematic at the end. http://www.cathodecorner.com/nc620akitman.pdf The only caveat is that capacitance in the Nixie tube

Re: [neonixie-l] CRISTAL + CAPACITOR = TIME DELAY HELP

My Nixie watches have a variable 5-30pF capacitor on the crystal so that I can adjust the oscillator to exactly 32768 Hz. You could use a different value depending on your crystal characteristics. I use an old Hewlett Packard universal frequency counter, running in time period averaging mode,

Re: [neonixie-l] OT: How to convert composite video into TTL?

I built a couple LED TV sets about ten years ago. I had to solve this problem. I bought a sync separator chip for the first one, and a digitizer chip for the other. See the bottom of the page for schematics. http://www.cathodecorner.com/satanvision/ On Sat, Apr 10, 2021, 6:04 AM jb-electronics

Re: [neonixie-l] LM-324 op amp

Bill, That's not a good idea. It is likely to oscillate. See my other reply. On Thu, Apr 1, 2021, 6:37 AM Bill van Dijk wrote: > Ty the unused inputs to ground with a 10K resistor, float the unused > outputs. > > Bill > -- You received this message because you are subscribed to the Google

Re: [neonixie-l] LM-324 op amp

The standard way is to connect it as a unity gain buffer. Connect the non inverting input to Gnd and connect the inverting input to the output. On Thu, Apr 1, 2021, 5:53 AM chuckrr wrote: > What is standard procedure for tying off unused op-amp inputs? > > If for instance there is a circuit

Re: [neonixie-l] Nixie dashboard for a car

I'm building a Nixie instrument cluster for my Corvair. It's designed to fit in the space formerly occupied by the speedometer. There are six displays, made with 4998 and 5870 tubes. The drivers are 74HC595 shift registers and TBD62084 HV arrays. It's not multiplexed. A Teensy 3.2 in a box under

Re: [neonixie-l] USB connector shield

The shield has a function of handling a static discharge when the plug is attached or the board is touched. A conductive ring around the edge of the PCB connected to the shield will prevent blowing out the electronics when that spark occurs. A resistor from shield to signal ground is reasonable.

Re: [neonixie-l] Paralleling Nixies

The cathodes of all paralled Nixies will be pulled to 0 volts. I was assuming that you would use a separate anode resistor for each Nixie tube, because otherwise it wouldn't work for the reason that you state. On Sat, Jan 2, 2021, 8:20 AM Bill van Dijk wrote: > David, > > > > Are you sure

Re: [neonixie-l] Paralleling Nixies

1. There is no reason that you couldn't run nixies in parallel, other than the maximum current rating of the driver chip. 2. Getting Nixies to light up in the dark can be tricky. My Nixie watches sometimes take a second or so to start glowing in a dark room. A second activation displays normally.

Re: [neonixie-l] How close together do a controller and crystal need to be?

Don't worry about it. This is a CMOS 5V signal, I presume. It only has one load, at the far end of the trace. You do not say what the frequency is, so I will guess that it's on the order of 5-20 MHz. The signal integrity is important, to prevent ringing that would double-trigger the load circuit.

Re: [neonixie-l] First LED displays

The Monsanto MAN-1 was just about the first. It was a calculator sized single digit in a 10 pin flatpack with staggered pins. HP made their display with a controller chip in it soon after. I have a huge three ring binder full of display brochures from 1969 that I found at Black Hole surplus about

Re: [neonixie-l] How to kill a microcontroller with one finger

The voltage feedback resistor is a low impedance node on every voltage regulator design that I have worked with. Typically 1k ohm. I don't see how that could happen. On Wed, Dec 9, 2020, 12:30 PM newxito wrote: > I just wanted to share something that happened to me yesterday. I killed > the

Re: [neonixie-l] Amperex 8453 Counter tube

I.C. means Internal Connection. It's usually connected to part of the tube structure. Leave it unconnected. On Wed, Oct 28, 2020, 5:23 PM peter bunge wrote: > I searched on this tube and found nothing. > Before I spend time designing a circuit to drive it, has any one already > done so? > I

Re: [neonixie-l] Re: 14-digit nixie calculator project with clock function

That's really cool! I have wanted to make a Nixie tube version of an HP-11 for years, but got stuck on the keyboard. I have a box of +- tubes if you're interested. On Mon, Oct 26, 2020, 3:59 PM newxito wrote: > The B-5870 calculator is now finished. In this version I made some minor > changes

Re: [neonixie-l] IN-12 dead time

I built a bunch of multiplexed clocks in 2001-4 using the 74141 chip, which the Russian chip is a copy of. I used various Burroughs and Philips tubes. I found that the multiplexing worked well on a PC board, with 100 microseconds to a millisecond of dead time before changing the binary value at

Re: [neonixie-l] Nixie watch as a lockdown project - almost done! ADCON0 puzzle

Max, Hi. I wrote all that code. The NWR watch that I designed uses all the capabilities of the PIC16LF722 chip. It was carefully engineered to do exactly what it needs to do and nothing more. Every pin does useful work, some of them doing two or three jobs at once. It has absolutely zero room

Re: [neonixie-l] Re: nixie watch project

Kevin, That's quite a project! It has a lot of processing power. I can tell that you've put a lot of thought into the design. I'm curious about the plans for software and features, since you mentioned that you haven't written any of it yet. The big limiting factor of Nixie tubes in a

Re: [neonixie-l] Calculator or clock?

I have made a couple thousand Nixie watches using two B5870 tubes in each. They are quite reliable tubes. They do occasionally short out if bumped too hard. I once found a calculator that had these tubes in a thrift store. Its rightmost tube was worn out, probably from being left running

Re: [neonixie-l] Copy PIC?

It's possible only if the protection bit isn't set. But you need a Microchip programmer. Then you build a circuit board that has the ISP programming pins on a header. It would be easy for me, because I've been using them for years. On Fri, Sep 11, 2020, 2:32 PM 'orange_glow_fan' via neonixie-l <

Re: [neonixie-l] Nixie calculator display

Ghosting is usually caused by changing the cathode value too soon after turning off the anode at the end of the display time for that digit. Try waiting a millisecond with all anodes off before writing the next cathode value. On Fri, Jul 17, 2020, 7:40 AM Paul Andrews wrote: > > I have had a

Re: [neonixie-l] Figure 8 in non-numeric tubes?

It's also present in numeric tubes, halfway through the stack. It's an anode. Probably keeps the voltage drop more consistent between cathodes On Thu, Jul 9, 2020, 12:29 PM Mac Doktor wrote: > All of the +, -, sine etc. Nixies I've seen have what appears to be a > numeral 8 cathode behind the

Re: [neonixie-l] help identifying a Nixie PC board

Phil, Those are not ZM1000 tubes. They are B5870. I could probably trace out the circuit and figure out what types of chips it uses, which is what you need to make it run. It's most likely a frequency counter. On Fri, Jul 3, 2020, 1:20 PM alb.001 alb.001 wrote: > > > I found this old pc board

Re: [neonixie-l] New soldering station recommendations...

I love my Metcal MX500, but it's pricey. I got it used. If a large part of your livelihood involves soldering, it's worth the investment. On Sun, May 31, 2020, 10:25 AM martin martin wrote: > There I was building yet another Nixie clock from pvelectronics when my 35 > year old Weller soldering

Re: [neonixie-l] CRT colors

There are a variety of phosphors used in oscilloscope tubes. Here's a rundown: P1 is the original green. It's long lasting. P4 is white, faster. It's not common in smaller tubes, as it was used primarily for TV sets. P7 is a radar phosphor with a fast blue glow and a yellow afterglow. P11 is fast

Re: [neonixie-l] ga22v10 help

>From the one data sheet OCR scan that Google offers: "All GA22VP10s are factory-configured by Gazelle 's Quick-Turn laser technology". Sounds like it's a pre-programmed museum piece, since the factory is clearly no longer around. I did tons of PLD

Re: [neonixie-l] A new high (or low....)

That tube is missing part of its glass envelope. On Wed, Apr 1, 2020, 11:34 AM Nicholas Stock wrote: > > > This made me chuckle a bit then shake my head in dismay > > -- > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe

Re: [neonixie-l] Re: status of original Weisling FLW kit design? Clone kits? Software?

Greg, Overvoltage is not a problem if at least one cathode is turned on when the anode is turned on. On Tue, Mar 6, 2018, 9:58 AM gregebert wrote: > Interesting. The HV5812 is a CMOS device rated for 80V, so it will be > vulnerable to overstress if the nixie tubes leak (no bleeder resistors are

Re: [neonixie-l] 74141 decimal place

The 74141 was created back in the Switch Age, when a rotary switch was used to select which digit had the point. What do you want to use the decimal point for? On Mon, Feb 24, 2020, 9:22 AM John Snow wrote: > I'm trying to use 74141 drivers (intentionally), they have enough outputs > to drive

Re: [neonixie-l] LED constant-current power supply

This supply is probably the correct one for your application. You will need to use a series resistor on each IN-28 tube to get them to start ionizing, since the lit tubes will run at a lower voltage than the unlit tubes, which will prevent the unlit tubes from striking. There is an adjustment for

[neonixie-l] Re: 3ACP11 CRTs for sale

Folks, I have found homes for all the 3ACP11 tubes I have. I'll send each of you an email from Cathode Corner. Thanks for your interest. On Tue, Feb 11, 2020 at 12:04 PM David Forbes wrote: > Hi, > > I have a dozen NOS Dumont 3ACP11 tubes available. I also have Cinch > diheptal so

Re: [neonixie-l] P12 Phosphor CRT

In case you're wondering, I first made a scope clock in 2001, using a 3BP1 tube and an analog Lissajous circle generator. I eventually ran out of custom power transformers, and redid the design in 2008 with a new generation of circuitry. I am working on an updated design using a Teensy to generate

Re: [neonixie-l] P12 Phosphor CRT

gt;> Would seem an odd phosphor to use for radar displays then...maybe you had >> a bad tube? >> >> On Mon, Feb 10, 2020 at 9:01 AM David Forbes >> wrote: >> >> I made a clock with a 3JP12 back in 2002 when I was doing that. It lasted >> a few wee

Re: [neonixie-l] P12 Phosphor CRT

I made a clock with a 3JP12 back in 2002 when I was doing that. It lasted a few weeks. That phosphor is rather delicate! BTW I am working on getting back into the scope clock business, making a laser cutter for the cases and using a Teensy to do the X-Y signal generation. I've already written the

Re: [neonixie-l] 1971 Nixie in a catalog

Those prices were pretty high, considering the average wage of $3/hour then. I'm surprised that they don't list the 8570 or similar tubes. Radio Shack and Lafayette sold those later in the 70s, after the bottom fell out of the Nixie tube market. On Sun, Feb 2, 2020, 10:36 AM Jeff Walton wrote:

Re: [neonixie-l] Testing Nixies

My Nixie watches use B5870 tubes with flexible wire leads. I use tweezers to form them to the arrangement of the socket and plug them in. I recommend that you solder socket pins into one digit of your clock, and plug each tube into that socket before soldering it in. Better yet, build the clock

[neonixie-l] Seahope Nixie watch

Someone sent me a nixie watch for repair. Turns out, it's not one that I made, but a Seahope watch from Japan. I just had to take out the module and check it out. It's a strange combination of exotic tech and backwards design. The CPU is a chip-on-board thing, but it's bigger than the PIC

Re: [neonixie-l] Ken Shiriff's awesome teardown of a Soyuz digital clock (not nixie)

That's quite a bit of sixties tech. Although the author doesn't seem to be familiar with the American spacecraft technology of the day, which was virtually identical. Ceramic flat packs were used since plastic packages weren't suitable for the extreme conditions. On Thu, Jan 23, 2020, 8:07 AM

Re: [neonixie-l] Distance on pins for PCB-socket versus solder-lug socket?

Martin, First, do not bend the pins on the tube. I cannot tell what exactly is your concern. Is it the gap between pads for high voltage creepage? You can maximize this by using an oblong pad. If you have any solder tail sockets, you can use those. I made a bunch of Nixie clocks in the olden

Re: [neonixie-l] Re: NixiChron thinks it's 04 16 00, at least for today...

That time difference is exactly 1024 weeks. The people who conceived the GPS data format foolishly gave it a ten bit field for weeks, so it's a baked-in flaw. You have a clock that assumes the 2000-2019 epoch instead of the 2020-2040 epoch. It's possible to fix this in the firmware. Someone has

Re: [neonixie-l] Re: 7 Segment Common Anode Display

There is no reason to use a fancy Maxim chip for an LED display. Two 74HC595 SPI shift registers and two 74AC245 octal buffer chips will do the job. One for the anodes, one for the cathodes. On Mon, Nov 4, 2019, 3:41 PM gregebert wrote: > The Maxim part you mentioned is for VFD's, and it looks

[neonixie-l] Cyclox II clock tube

I had someone ask me about a replacement tube for a Cyclox II clock. Do any of you know what tube it uses? -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to

Re: [neonixie-l] Nixichron down - can you help me?

Your clock needs to have its parts checked individually for shorts. This usually involves desoldering things. I fixed one of those clocks once, took a couple hours of surgery to repair the PC board where it had developed a carbon track under the HV switch FET. On Mon, Sep 23, 2019, 9:30 AM

Re: [neonixie-l] NIB 5870ST

How many? How much? On Sat, Aug 17, 2019, 12:38 PM Nicholas Stock wrote: > Anyone interested in these before they go on the Bay? > > Cheers, > > Nick > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and

Re: [neonixie-l] power supplies and radio interference

I work in radio astronomy, and I wear a Nixie watch. No problem. But seriously, it is possible to build a low-emission switching supply. It takes time and care and shielding. High voltage is more of a challenge. On Fri, Aug 16, 2019, 12:27 AM johnk wrote: > From time to time I come across

Re: [neonixie-l] Re: Yet another nixie power supply

You might want to check the output with an oscilloscope, to see if the pwm control is oscillating. Then tune the loop response to prevent that. On Sat, Aug 3, 2019, 1:32 AM jörg wrote: > Hi, I've build pretty the same powersupply with the DA2032 and LT3757. I > love the small formfactor

Re: [neonixie-l] B-16851453 nixies

That looks like the original Xerox machine copy counter. It had three rotary switches whose shafts we see, along with bulbs to illuminate the numbers, to the right of the Nixie tubes. On Thu, Jul 25, 2019, 10:24 AM martin martin wrote: > the same site has these! >

Re: [neonixie-l] B-16851453 nixies

Photos please? On Tue, Jul 23, 2019, 8:21 PM Nicholas Stock wrote: > Anyone got a data sheet for these little buggers? > > Nick > > -- > You received this message because you are subscribed to the Google Groups > "neonixie-l" group. > To unsubscribe from this group and stop receiving emails

Re: [neonixie-l] Re: What do you guys think of my homemade Nixiewatch?

Nice set of features. The case looks awfully similar to my square Nixie watch. I guess that's where the design converges to. I'm still puzzled why other people need an RTC chip and a fast computer to make a Nixie watch. I can get excellent results from a PIC running at 32 kHz, keeping time in

Re: [neonixie-l] Bipco units

John, That WPS (Tom Jennings) documentation page came from me. It's just catalog pages, not installation or operating guides. It's not enough to use the gizmos. On Mon, Jul 15, 2019, 6:24 AM 'John Rehwinkel' via neonixie-l < neonixie-l@googlegroups.com> wrote: > Those Bipco things aren't

Re: [neonixie-l] Bipco units

Those Bipco things aren't documented, so they're pretty useless. On Sun, Jul 14, 2019, 8:50 PM Nicholas Stock wrote: > Anyone know what to do with old Bipco units for burroughs tubes? I have a > bunch and am wondering what I could use them for(apart from the > obvious), which probably

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