Re: [neonixie-l] Off topic..but it's a clock question.....no neon! Part ID....

[Sture Nystrom]

I think it's an NPN transistor but not sure. I can only test one 
junction (B-C) and even that is reading higher than seems normal.  I'm 
going by the board markings and am not sure of the actual basing. The 
board is from a Seth Thomas, Acquisition Clock that dates from around 
1972 or so...


Thanks for looking..

Kerry

It looks like a 2SC183 transistor. Can be fond at ebay: 
https://www.ebay.com/itm/162550924156


Sture

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Re: [neonixie-l] Early ZM1000 nixie failure

[sture nystrom]

I had a similar massive darkening on a IN-14 tube some years ago. Repalced
tube and it have working good since then. I supposed air have come inside
tube.

Sture

2016-03-26 8:29 GMT+01:00 franetic :

> Hi all,
>
> can anybody (of more experienced builders) explain extreme darkening of a
> (then new/unused) ZM1000 nixie tube in just 3 months? The failed nixie was
> used in a clock in the minutes position. (The clock is a multiplexed 2x2
> design, 10mA peak current at 25% duty cycle - this hits the average 2.5mA
> cathode current.) I've built a few of these clocks, and have never seen a
> ZM1000 fail like this. (I also use that clock at home and another one at my
> office, they have been running for years with a little silvering at the
> bottom and only slightly noticeable darkening.) One thing that I noticed is
> that the failed nixie has the anode grid cage quite a bit more out of place
> than usual. Could this be the culprit?
>
> Thanks,
> Damir
>
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Re: [neonixie-l] Re: Need help with a tubehobby clock overheating

[Sture Nystrom]

A faulty inductor with some windings short cuted will make switching 
transistor go hot.


Kiran Otter skrev den 2015-04-10 17:12:
Well.. I replaced the voltage regulator with JT's part, it appears to 
be working perfectly.. a solid 5V right on the mark.  I also replaced C1.


The ghosting numbers are still there but very faint.. but the MOSFET 
(M1, an IRF640) is still getting extremely hot.  You know when a 
component gets so hot it has that hot-electronics smell? It's that 
hot.  The voltage to the tubes is right on 170V.  I didn't have to 
adjust it after replacing the two components.


Should I replace the MOSFET?  Any other suggestions? :)

Kiran
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Re: [neonixie-l] Need help with a tubehobby clock overheating

[Sture Nystrom]

Kiran,

Measure the input voltage to your clock. If voltage from your DC wall 
adapter have risen 7805 regulator will go hot. Also high voltage to 
Nixie tubes might also rise if input voltage to clock is too high.


Sture


Kiran Otter skrev den 2015-03-28 12:55:

Hi folks, glad to find this group!

I've had a Tubehobby clock for several years, the NCV2.1 with the 
IN-18 tubes.  In the past Jonas has helped, and I even shipped him the 
main board for him to repair, but he hasn't responded to my last 
request for help, so I thought I would ask here.


Recently, I started to notice that other digits in the tubes were 
partially lighting up, and eventually the fuse blew.  My assumption 
was that the K155ID1 drivers had started to go, so I ordered six of 
them off eBay, and tried replacing them.. which isn't hard, everything 
is socketed.   Well it didn't help, so I contacted Jonas.  Jonas 
suggested replacing C6, which I did and it appeared to fix the problem.


Maybe a month later, I started to notice the left most digit was 
faintly showing numbers, and seemed to be influenced by the next to 
right digit.  So I thought perhaps the drivers I got from eBay weren't 
good, so I swapped them around, trying to see if it made any 
difference.  Unfortunately, I trashed the two original driver chips 
that came with the kit.  So far swapping the drivers around among the 
six I have, hasn't changed anything.. or if it has, the digits 
lighting that shouldn't be have moved from tube to tube.


Well I let the clock run like this for a week or so, and one day I 
just happened to feel around the voltage regulator U1 (L7805CV).. and 
it's blazing hot. I put a temp probe on it and it's running at 140F in 
open air, and when I built the clock, I epoxied a heatsink to it.  It 
never ever used to get this hot. In fact the clock has run for years 
in a closed enclosure with very little ventilation.  It just never 
produced much heat at all.  I swapped both driver chips for two 
others, and it still gets just as hot.


When the clock shuts off the display at night, the temp drops to just 
above room temperature.


So my guess is has to be one of two things I replaced; C6, or the 
driver chips.  I think it's the drivers, and I'd like to get a pair 
from somewhere reputable so I can at least rule them out as the 
problem.  I've seen some that appear to be ceramic, instead of plastic 
cased.. claimed to be 'milspec' but I donno if that's BS or what.


Any help is appreciated!

Kiran




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Re: [neonixie-l] Nixie Clock Cool Project- a few questions

[Sture Nystrom]

Darin,

Measure what you have for voltage from the power supply unit. If it is a 
simple unregulated power supply voltage can be above 12V. Cheap power 
supplies are often built of a transformer, four diodes and a capacitor.


Sture

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Re: [neonixie-l] Same kind of screen used in old radars?

[Sture Nystrom]

Same link but shorter /Sture
http://www.ebay.com/itm/321356330231


Dman777 skrev 2014-08-22 07:49:
Is this the same kind of screen that was used on antique radars that I 
have seen on here?


http://www.ebay.com/itm/Rarest-NOS-NIB-NIXIE-MATRIX-screen-100x100-1-Z568M-tube-vfd-IN-18/321356330231?_trksid=p2047675.c100010.m2109_trkparms=aid%3D555012%26algo%3DPW.MBE%26ao%3D1%26asc%3D20131231084308%26meid%3D32c373bc264642348b89ae48c325360a%26pid%3D100010%26prg%3D20131231084308%26rk%3D3%26rkt%3D24%26sd%3D321346505250
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Re: [neonixie-l] Re: dekatron computing [and other stuff]

[Sture Nystrom]

Tidak Ada skrev 2014-01-31 13:56:
Her a link to the Bletchley Park site/News: [ 
http://www.bletchleypark.org.uk/news/ ]

eric



There is a mini series about Bletchey Park. Very exciting, I thought 
when I saw it on TV.


http://en.wikipedia.org/wiki/The_Bletchley_Circle

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Re: [neonixie-l] Visit Dalibor's Nixie Tube with my owneyes in Shanghai Museum of Glass

[Sture Nystrom]

Exellent work! A piece of art. First Nixie Clock ever shown in a Museum?
/Sture


严泽远 skrev 2013-12-21 15:08:
 “When Shanghai meets Prague” exhibition �C Visit nixie tubes made by
 Dalibor at Shanghai Museum of Glass.

 I went to Shanghai Museum of Glass today, and I saw the tubes build by
 Dalibor from CZ.
 It's beautiful, very big tubes, Dalibor named this work of art
 Shanghai time, I named it 上海时光 ;-)
 I post many pictures in my Blog here:
 http://www.nixieclock.org/?p=533
 My friends and I voted for Dalibor, very good work.
 BTW: this clock used my NCH6100HV nixie power supply, please check
 details here:
 http://www.nixieclock.org/?p=493
 Share pictures with friends here:

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Re: [neonixie-l] Testing nixies/dekatrons/neon bulbs without powersuply

[Sture Nystrom]

Does anyone know if the trick is possible to do with a Scopeclock?

Sture

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