[neonixie-l] Re: Tectrol SP215 VFD power supply data

[5-ht]

Larry,
You might check with CUI (cui.com); they bought Tectrol a few years ago and 
might still have data on Tectrol products.

If the pinout of this converter conforms to the majority of ones that I 
have seen, the two pins on the left would be the input.
As this was intended for VFDs, I would expect that the top two pins on the 
right would be the 30 VDC output and the bottom three would be the 3.7 VAC 
filament output, with a center tap. Often the center tap is either grounded 
or perhaps elevated a few volts DC for cathode bias when used with 
multiplexed displays.

Just my guess!

Mark

On Saturday, April 1, 2023 at 7:43:05 AM UTC-5 Larry wrote:

> Anyone have any information on the Tectrol SP215 VFD power supply? Pin out 
> or any information would be helpful. I have searched but not been able to 
> find any data.
> Thanks
> [image: tectrolSP215top.jpeg]
> [image: tectrolSP215pins.jpeg]
>

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[neonixie-l] Re: Finding a new home for a barely used EleksTube IPS

[5-ht]

Aiden,
I'll take it!
Shipping would be to zip code 77065.
Thanks,
Mark
On Tuesday, July 6, 2021 at 2:04:04 PM UTC-5 ai...@omnixie.com wrote:

> Bought this a while back but didn't actually use it. See the actual photos 
> below.
>
> It sells $189 on their official website. eBay has a bit lower price, 
> shipping from China.
> Asking for $120 with actual shipping. Will ship form California, 94065.
>
> Let me know if you are interested. Thanks~
>
> Warm regards,
> Aiden
>
>
> [image: IMG_4285.jpg][image: IMG_4287.jpg][image: IMG_4288.jpg][image: 
> IMG_4289.jpg][image: IMG_4290.jpg]
>

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

[5-ht]

Jens,
The horizontal sync requirement of this monitor (52 uS / 19.2Khz) is 
somewhat higher than a standard NTSC signal which is about 63 uS / 15.7 Khz.

Mark

On Saturday, April 10, 2021 at 8:04:15 AM UTC-5 Jens Boos wrote:

> Thank you! I did some more digging and found the service manual for the 
> display (Panasonic TR-60S1A, see here: 
> https://www.opweb.de/english/company/Panasonic/TR-60S1A)
>
> There is is a timing chart (see below). It looks an awful lot alike NTSC 
> to me, can somebody confirm?
>
> Best wishes
> Jens
>
>
>
>
> On 2021-04-10 12:28 a.m., Adrian Godwin wrote:
>
> It's easy enough to extract the sync signals, as you've seen. It may not 
> be particularly difficult to modify the TTL input to analog, or to create a 
> TTL level signal if you don't need a grey-scale.  On many general-purpose 
> monitors like that they could often be built for either standard - the 
> microvitec Cub  popular with the BBC Microcomputer had that option. 
>
> But the critical thing is that it runs at the right speed. CRT circuits 
> are built around the line oscillator which generates the horizontal scan 
> AND the EHT voltage. It was only when multisync monitors came along that 
> the optimisation was split to reduce the dependency. And if the frame 
> frequency is wrong, you will often have problems getting a full frame scan 
> when you force it into sync.
>
> So the first thing is that you need to make sure the 8920 monitor ran at 
> either PAL or NTSC rates so you can choose a raspberry pi format to match. 
> There's a good chance it's NTSC but later monitors like the ones in the 54 
> series of digital scopes were more like the IBM standards MDA and EGA (CGA 
> was NTSC). 
>
> On Sat, Apr 10, 2021 at 4:28 AM jb-electronics  
> wrote:
>
>> Hi all,
>>
>> This is a bit of an off-topic question, but I hope there will be 
>> somebody here that can help. I have bought a new-old stock monochrome 
>> CRT for a HP Agilent 8920A, basically this unit here: 
>> https://www.ebay.com/itm/273930914548 .
>>
>> It looks to me that it is just a rebranded OmniVision 6" display: 
>>
>> http://www.omnivisionusa.com/Industrial-LCD-CRT-Monitors/replacement-crt/crt-monitors/6-inch-kit-.html
>>
>> Now unfortunately it takes TTL video as input. But I have a composite 
>> source (a Raspberry Pi). How can I convert composite into TTL? I 
>> basically need to extract Hsync and Vsync and feed it separately to the 
>> unit, okay. There is an old circuit here that does just that: 
>> https://www.elektormagazine.com/magazine/elektor-198812/47485
>>
>> But I know there are also dedicated chips, like the GS1881: 
>>
>> https://www.mouser.com/datasheet/2/761/GS1881_GS4881_GS4981_Datasheet-769183.pdf
>>
>> So basically here is my question: before I dive into this any further, 
>> is there any chance of success? What is the optimal choice? Or is it 
>> quite unlikely that I will be able to convert the signals? I mean, even 
>> if I manage to extract Hsync and Vsync, is it likely to work?
>>
>> I am sorry for the naive question, but I am no expert on video signals, 
>> and it would be nice if anybody more experienced could chime in with a 
>> few words of caution/experience.
>>
>> Best wishes
>> Jens
>>
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>> .
>>
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> 
> .
>
>
>

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[neonixie-l] Re: FW-4 rev c

[5-ht]

Hi Jeffry,
Your circuit board appears to be missing U1 which is a 78L05 5V regulator 
in a 8-SOIC SMD package.
This design originally required a 12-18VDC external power supply (350-500ma 
should be sufficient, the coaxial connector is center-pin positive) but I 
guess one could power it with separate 5V and 12-18V power sources. The 
5VDC powers the logic and the 12-18VDC the high voltage generator for the 
tubes.
The part number for the missing 5V regulator is LM78L05ACM-ND form Digikey 
and 511-L78L05ABD from Mouser.

Mark
On Tuesday, November 24, 2020 at 9:00:00 PM UTC-6 Jeffry P wrote:

> I have a FLW by Pete Hand  that has been in storage a few years and I hope 
> the group can help me get it working up and running. The device was 
> functional when I put it into storage.
>
> 1) What are the power requirements?
>
> 2) there is a jumper wire dangling off a pin in between the #4 and the 
> power connector and I don't know where is supposed to attach.
>
> 3) There was another jumper wire in the box and I'm not sure where it goes.
>
> I've attached some pics
>
> Thank you ,
> Jeffry
>

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[neonixie-l] Re: Futaba M202LD05AA info anyone?

[5-ht]

I have a datasheet on the Futaba M202MD15DA. 
It's a two row by 20 character display using a 5x8 matrix.

Mark


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[neonixie-l] Re: VFD Filament Current

[5-ht]

FYI, Noritake has some good information regarding VFD driving and filament 
bias:

https://www.noritake-elec.com/technology/general-technical-information/vfd-operation

Mark



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Re: [neonixie-l] NL-50944 Infos?

[5-ht]

FYI, crystals in glass cases are still being manufactured.
Total Frequency Control in the UK list some in the H/C-26U type case.
See: http://www.tfc.co.uk/pdfs/HC-26-U_TFC.pdf
( I have no connection to this company.)

Mark

On Friday, May 18, 2018 at 4:37:17 PM UTC-5, Terry Kennedy wrote:
>
> On Friday, May 18, 2018 at 2:02:32 AM UTC-4, Tomasz Kowalczyk wrote:
>>
>> I suppose there are two reasons why so many pins are present. One is 
>> locating the right position of the tube - if you skip most of the pins, 
>> then orientation can be located only by judging where the front of the tube 
>> is. If there is only one way to put something in something, then the risk 
>> of something wrong happening is minimized.
>>
>
> In the referenced tube, the entire inner ring of pins could be omitted 
> without losing positive keying, and none of the inner ring pins are used on 
> that tube.
>  
>
>> Also, if the socket has all 27 slots present, but the tube doesn't, 
>> someone might thing his tube is broken, as it has less pins. 
>>
>
> I doubt this was much of an issue in the original application, as assembly 
> (and most likely repair) would be done by people familiar with the product.
>  
>
>> The other reason is that as far as I know the stems weren't produced by 
>> the same companies, or at least not in same factories, so ordering unique 
>> bases was more problematic than just purchasing same type as for the other 
>> tubes. 
>>
>
> This is more likely. Economy of scale may mean that it would be more 
> expensive to omit the pins. And if the bases were made by a different 
> company, the rejected part ratio was not the tube company's problem, as 
> long as rejects were found by the supplier before the tube company 
> assembled the final product, and the supplier's prices remained low enough. 
> That can sometimes be problematic - I was called in to fix a disk drive 
> design problem in the 80's where the drive manufacturer was having a 90%+ 
> incoming reject rate on outsourced hybrid modules which were made by one of 
> the most well-known companies in that field.
>
> Back on tubes, the omitted-pin business seems to be more common on tubes 
> where a) the base was not part of the evacuated system and b) there was 
> already some positive keying method (such as octal base) in place. It was 
> very common for TV picture tubes to not have all pins populated, for 
> example.
>
> At the glass company I worked at, most production was for relatively 
> high-cost / low-volume products. One big exception was a part (something 
> like BC1237 - I forget the exact number) which was the base + lead assembly 
> we made for Motorola, used for a 3.58MHz crystal in TV sets. Those went out 
> in orders of 10's of thousands at a time. We did all sorts of esoteric 
> stuff, like crystal housings where everything but the lead wires and the 
> base / cap seal ring were clear glass. That was for a military application.
>

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[neonixie-l] IN-9 or IN-13 Audio Spectrum Display

[5-ht]

So this is kind of cool:

See: https://www.youtube.com/watch?v=Pv2RSYXdVcs

I have no connection to any of this other than lust.

Mark

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[neonixie-l] Re: nwts now with case

[5-ht]

Manuel,
This looks great - I would also appreciate a discount coupon.

Thanks,
Mark

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[neonixie-l] Graphic Weather Display For Your Next Scope Clock?

[5-ht]

Thought this was rather cool and intriguing.
See: http://hackaday.com/2016/03/12/raindrops-on-an-oscilloscope
I have no connection to any of this.

Mark

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[neonixie-l] Re: Make a clock, go to jail

[5-ht]

Let's just hope that he used the International Color Code for Bomb Wiring 
so that any erstwhile hero can easily disarm it at the last second.

Mark

On Wednesday, September 16, 2015 at 5:17:55 AM UTC-4, petehand wrote:
>
> Although nothing should surprise me by now about the insanity of the 
> American school system, this one touches a nerve. A kid - a young teenager 
> - made a clock of his own design, took it to school, and found himself in 
> police custody accused of making a fake terrorist bomb - a "movie bomb". 
> Maybe it wouldn't have happened if he'd used nixies instead of 7 segment 
> displays, as then the morons at his school might have asked him what it was 
> instead of instantly recognizing it as a deadly bomb like the ones they've 
> seen in Hollywood movies. Way to go, teachers, for discouraging him from 
> ever doing anything creative like that again.
>
> https://www.youtube.com/watch?v=3mW4w0Y1OXE
>
>

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[neonixie-l] Gigantic Flip-Dot Wall Display at the Consumer Electronics Show (CES).

[5-ht]

Really large flip-dot wall!

Video on YouTube:
https://www.youtube.com/watch?v=SJU2-1X8kHQ

Hackaday article:
http://hackaday.com/2015/01/14/the-giant-flip-dot-display-at-ces/

Mark

http://hackaday.com/2015/01/14/the-giant-flip-dot-display-at-ces/


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[neonixie-l] Not-Nixie-Related: Unusual Discrete Component LED Clock.

[5-ht]

Perhaps someone had noted this build before?
See: http://techno-logic-art.com/clock.htm

Mark

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[neonixie-l] A truely high-power schematic generator.

[5-ht]

I wonder how many of these actually got installed?
See:
http://vimeo.com/75532300

Mark

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[neonixie-l] Omega OCC1 Nixie Master Clock on eBay

[5-ht]

Found this Omega OCC1 Master Clock on eBay:

http://www.ebay.com/itm/110996199151

I have no connection to this listing.

Mark

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Re: [neonixie-l] Re: Wanted - a quantity of faulty B7971s

[5-ht]

There is an image of the schematic of this board on the old Yahoo Neonixe 
website. It's not great quality but I think most of it can be made out. 
Certainly better than starting over from scratch.
The file is named b7971board.djvu and can be found here (for those who 
still have access):
http://groups.yahoo.com/group/NEONIXIE-L/files/Nixie%20Tube%20Data/

Mark


  

On Monday, October 8, 2012 1:43:18 PM UTC-4, nixiebunny wrote:

 On 10/8/12 10:02 AM, kay486 wrote: 
  Keep your eye on this (im not realted to the auction anyhow) 
  http://www.ebay.com/itm/320997749249 

 Thanks for the link! I've saved the images for reverse engineering the 
 PC boards later. 

 Those boards (with tubes!) sold for $5 each in the mid 1970s... 

 http://www.nixiebunny.com/b7971ad.jpg 

 -- 
 David Forbes, Tucson AZ 



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[neonixie-l] Really Amazing Flip Dot Display

[5-ht]

See: 
http://breakfastny.com/2012/06/reactive-super-speed-electromagnet-dot-display-per/#content

It's a 23' by 12' display that's real time interactive.
I hope to see this in person next week.
Mark

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[neonixie-l] Re: visiting Boston

[5-ht]

My former hometown! Of course Boston is just lousy with history. The
Freedom Trail (http://www.thefreedomtrail.org/tickets/tours.html) can
be quite interesting but your two year old might find it a bit boring.
Something fun for all ages is the New England Aquarium (http://
www.neaq.org/index.php), one of the most amazing aquariums anywhere.
It's in downtown Boston and right around the corner from Quincy Market
which has a dazzling array of food (my favorite hobby) and all manner
of arts/crafts/souvenir vendors.  There are a zillion museums in the
greater Boston area.
In Cambridge itself the MIT Museum (http://web.mit.edu/museum/) is
always worth a visit. I believe Harvard's main art museum is still
closed for renovations but there are several others on campus
including one that has a collection of historical scientific
instruments (http://www.fas.harvard.edu/~hsdept/chsi.html).
Have fun!
Mark

On Jun 14, 8:52 am, marcin marcin.r.adam...@gmail.com wrote:
 Tim has started it! ;)
 I will be in Cambridge/Boston next Monday-Wednesday. My wife will be
 conferencing at the Uni, I will be having fun with our 2-year old.
 What to do??? The whale watching we will all do together afterwards.
 Recently we visited Stockholm in the same arrangements and the little
 one loved alcohol museum and bars. So, he is OK :D

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[neonixie-l] Nixie Conference Badge

[5-ht]

Nixie conference badge!

See here:
 http://hackaday.com/2011/04/18/nixie-tube-conference-badge

And here for more details:
http://warrantyvoidifremoved.com/troopers

Mark

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[neonixie-l] Interesting $1 RTC that will log power failure and restoration

[5-ht]

Just saw a posting about the Microchip MCP79410 series of I2C RTCs.
See: http://ww1.microchip.com/downloads/en/DeviceDoc/22266B.pdf
Have your next clock show when its main power was lost and restored.

Mark

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[neonixie-l] Re: Nixie power supply

[5-ht]

This appears to be an Endicott Research Group's E700 series DC-DC
converter. 15 VDC in, 200VDC out at 15ma, regulated.

See: http://www.ergpower.com/pdf30/DC_DC_Converters.pdf

Mark

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