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Can I use a MM5375 clock IC with six B7971 Nixies and a www.tayloredge.com/ HV power supply?

Recently there were several lots of sockets for Elesta EZ10A dekatrons sold on eBay from a couple of sellers. Was wondering if anyone here was amongst the lucky winners and would be prepared to sell/swap one? Thanks, Jon.

Can someone explain how you would wire this up? I don't quite get it. It's a NC switch and input 3 appears to be the pin that controls if its open. I don't get how I would wire it. Thanks. datasheet: http://www.cui.com/pdffiles/PJ-102A.pdf

Two months ago I got a 4-digit dekatron counter there. /mike

Hi! For all who saked me about the sockets: I have them available now - Look at Ebay: Item#: 330452478316 European buyers: 330452491420 (???`.._..??????`.._..-DIETER-.._..??????`.._..??????) http://www.nocrotec.com/

I am about to make a clock with the B7971 segmented Nixie tubes using a 6 digit controller chip, the?DS32KHZ and super cap I bought from Moses, www.neonixie.com a while back. see http://www.allspectrum.com/store/product_info.php?products_id=501 Any help with using this controller and the above tubes would be of much help. Here are my questions: I guess all I need to do is substitute the 74141 ICs with the DS8880 ICs and connect to the appropriate pin segments on the B7971. ?Is this correct??The problem is that the truth table for the DS8880 driver may not match the truth table for the 74141 driver. I have posted both data sheets. The biggest puzzle to solve is figuring out how to utilize the features of this controller for leading zero blanking, PWM dimming, cross fade and timed display off to preserve tube life with the DS8880 in place of the 74141 driver. I am not sure how to work with the Truth Table and BI/RBO or RBI input pins on the DS8880 driver in relation to the "blanking pin 27" on the controller to make this all work. The data sheet for the DS8880 states "The Blanking Input provides unconditional blanking of any output display, while the Ripple Blanking pins allow simple leading- or trailing-zero blanking." This is all Moses can say: DIGIT BLANKING By default the controller `blanks' digits by outputting all ones on the BCD lines. Blanking is required for PWM dimming, leading zero blanking and cross-fading to work properly. This default setting works well with 74141 Nixie Driver ICs, but if you are using other display drivers you might want to review the Digit Blanking option (#53). For example if you are using the controller as a simple LED binary clock, you would want to set this option to either 3 or 4. This will result in a low output on the BCD lines during dimming, correct for individual LEDs. A separate blanking output pin is also provided (pin 27), which can be used for dimming display drivers with separate blanking inputs. It can be set for low or high blanking. ● Option #53: Digit Blanking Method. Controls the digit blanking method and blanking output pin (#27). See assembly instructions for details. NOTE: This option refers to the logic levels used to BLANK (or turn off) the display. - 1: BCD all high, BLANK pin high - 2: BCD all high, BLANK pin low (default) - 3: BCD all low, BLANK pin high - 4: BCD all low, BLANK pin low NOTE: If using the blanking output pin of the controller wired to all the displays, the clock will not cross-fade or blank a leading zero properly since each digit needs its own blanking output. A simple solution is to hook up a NAND gate (for drivers with low blanking inputs) or a AND gate (for drivers with high blanking inputs) to the C and D connection of each BCD output (with BCD blanking set to high). Run the output of the gate to the digits blanking input. This works because BCD C and D will only be high when the controller commands a blank digit. NOTE: If you will be using the blanking pin, it is recommended to install a 3-way jumper in order to disconnect the drivers from the blanking output and connect them to a logic level that will result in an active display. This can be used in case the digit blanking option is accidentally modified to blank the display. If anyone can figure this out, I would be much appreciative. Moses will not give specific "engineering" advice due to liability. Thanks again for all your help. Dan

If anyone is in the Boston area it might be interesting to check out MIT's monthly flea market (3rd Sunday of the Month). Mostly it's a random mix of new or old electronics. There are vacuum tubes galore, connectors and cables for days, tons of knobs, analog meters and pretty random stuff. There are sellers with audio stuff from junk to high end. The only Nixie related item I've seen there was quite a few years ago someone had the boards with the pairs of B-7971's. They firmly wanted $30 for them. At the time that was more expensive than on eBay. There are sellers with cheapo flea market type items to one guy with a display of German Enigma machines. Some of the treasures I purchased are a 1970's 8080a microprocessor trainer ($5), Thin 12"x18" double sided pcb ($3), a 500' roll of silver plated teflon wire wrap wire ($3). I got a bunch of 1 of 10 thumbwheel switches from someone's "FREE" pile. Admit is $5 w/ $1 off if you print a copy of their flier. Google MIT FLEA for info. If you go, enjoy! Steve S.

Hi! I have started a $1 auction for a Numiclock X2000. Ebay: 330452135490 (???`.._..??????`.._..-DIETER-.._..??????`.._..??????) http://www.nocrotec.com/

Hi, I was wondering if anyone has run across a solid schematic for a VU meter based on these tubes. I've found finished projects, but not a good page that goes into build details.

Does anyone know where I can source these. They can drive six B7971 Nixies directly, 12 hour with lead zero blank, brightness control, date, enable Just add HV power supply at 170v and you are good to go. Data sheet uploaed to files section.

DD700 by babcock ds8880 dm8880 ds8884 dm8884 some by national semiconductor neon seven segment decoder driver BCD input with blanking and lamp test.hard to find must scrap out old digimeters to get them "now" use the CD4511and 7 MPSA42 transistors 35k to base 10k from base to ground ,ground the emiter,15k resistor from the collector to the neon segment 2k for the anode resistor i have run the big neo5000 THIS way , B7971,ZM1350 or is the BCD decoder you speak of is the 74141? one of ten nixie driver it must be the 74145 or 7445 1 of 10 lamp driver ... how many ma/lamp are they good for?(back to the CD4028 and the two uln 2003)

I am interested in learning more about the so-called "projection" displays that were used in a lot of 1970s industrial rack-mount type clocks. Does anyone on here have a reference or source for them? Thanks! Mike Harpe Sellersburg, IN USA -- Please note my new email address: mike@...

I am planning on purchasing my first new oscilloscope since the Heathkit one I built back in the 70's. I'm looking for recommendations and suggestions. My price range is somewhere around $500. I was thinking that a color LCD one would be a good choice.

Hello Chuck. Try the second schematic on my site.? f6fkn.com You'll find what you're looking for, although it's been drawn around a Russian EM84 :6E3P But you can indifferently use both, without any change inside the circuit. Sorry, but the English version of this site is not ready yet... Alain

Just saw this on Hack a Day. Haven't even read the writeup yet but knew it would make some folks happy here! http://hackaday.com/2010/07/09/nixie-sudoku/

I try to avoid for sale posts here, but I still have a couple extra of the PCBs for this http://minila.sourceforge.net/ that I need to unload. They are version 1.1 pcbs, professionally made double sided with plated through holes and solder mask. $25 shipped anywhere in the world, that's pretty close to my cost.

All, I've got four nice A101 Dekatrons here, and I'm trying to figure out a circuit for them. A simple spinner would be great, though I'd like to have it run 60hz so I can add it to a nixie clock (doesn't have to be in sync or connected to the same circuit, unless there's a way to do that. I'm about a 5/10 in my soldering/circuit skills; I don't usually work with "mains" voltage, but unless there are hv charged caps involved I know how to play safe. I've got a relatively well-stocked Fry's near my for components. This one is UK 240v: http://www.electricstuff.co.uk/dspin.html ...but I don't really understand the circuit, let alone how to double it. Alternately, has anyone used this: http://www.decadecounter.com/vta/articleview.php?item=874 "Yilane Systems YS-610 Universal Dekatron Computer" Seems more my speed, building from a kit. Eventually I'd love to be able to connect these to an Arduino. Thanks for your help!

Dear All, Is there by any change the possibility to get information on the IC, type MM5458. Long time ago stripped from a digital clock, but that's it. National Semiconductor logo. Further marking: +B8436 Most likely an OEM chip. I should like to "connect" to ZM1030 tubes Yahoo, Google and the like don't give any further information. Regards, Ben Puylaert The Netherlands

I was recently asked to look into the possibility of using the MM5375 clock chip with the B7971 tubes. The MM5375AC is available for $7 from a surplus house. It's the 50 Hz version of the clock chip, but it's not hard to convert 60 Hz to 50 Hz with a counter and a gate. It turns out that the MM5375 data sheet has a schematic diagram of a multiplexed Panaplex clock. The MM5375 chip drives the tubes directly! The method is to use a 28V DC supply to run the MM5375 chip, and DC couple the anodes to the digit outputs, and AC-couple the cathodes to the segment outputs. The chip is rated (absolute max) at 30V Vss to Vdd, and 55V Vss to display output pins. The circuit uses pulldown resistors to -40 to -50V on all display output pins. There is a little circuit in the cathode common line that appears to detect the turn-on of any segment and discharges a series capacitor to increase the anode-cathode voltage enough to make the tubes strike. Its time constant is 5 milliseconds, which is under one digit time. What I'm wondering is: 1. Has anyone built this circuit? Does it work? 2. Might the MM5375 be powerful enough to drive the big B7971 tubes? It's rated at only one milliampere drive current per cathode, but that's at 5V power instead of the 28V they recommend for this circuit. -- David Forbes, Tucson, AZ

I will be in Tokyo in two weeks and want to find the area where nixie and other vintage stuff can be found. Is it in the same area where all of the modern electronics shops are concentrated? I am also interested in finding a museum that would have a good collection of 60s and 70s Japanese consumer electronics on display. Of course, any other *must see* recommendations are welcome.