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

Well folks, I think I'm going to leave it like this for a while. I've mounted a little 20mm fan to blow across U1 M1. The extraneous digits lighting isn't significant enough to be an issue; I just assumed it had to do with the over-heating. I appreciate everyone's input. We'll see how long

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

Niek, I do have a scope, however I'd be lying if I said I knew how to use it. I bought it used with the intention of learning how to use it, and it's sat since then. You could probably say I know enough about electronics to be dangerous. I know what resisters and capacitors and transistors

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

Sorry, I think I was getting U1 and M1 mixed up in my earlier post. x.x U1 is ok, it's M1 that's getting quite hot. 109F now from the PCB side. It's hard to hit it on top because of the other PCB on top. But with the heatsink gone nothing is anywhere near as hot as it was before. Really

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

Now after running it a short while, U1 is about 98F and M1 is 112F. -- 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+unsubscr...@googlegroups.com. To post

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

Yes, it is. I took that video after removing it. I've also noticed the same effect in the minute digit. It also follows the seconds. I realize it's pretty faint, but this is the best it's been with the two driver chips I have in there now. With another pair, the left most tube constantly

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

Niek, Yes, it's showing the seconds in the hour digit, and in the minutes digit.. though not as strongly. If I force it to display the date or number of hours on the tubes, I can see whatever is in the most-right tube, faintly in the next to left tube. And I swear I can see the 6 in the

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

Nick, Would replacing the 7805 with a 'non-isolated dc/dc converter' like Jon suggested solve the problem too? I ask because I was going to try the Traco TSR 1-2450, or the Murata part (though I'm not sure it will fit.) I ordered both. I'll get my scope out today and see what I can see.

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

Something I want to note about how I used a heatsink; I epoxied it to the tops of the cases of M1 U1; traditionally you'd bolt it to the back of the component but at the time I couldn't figure out a better way, and I had heatsink epoxy, so I just plastered it to the tops of the two components.

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

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.

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

MichaelB, what did you lower the voltage to? And I did replace C6. Could I have a bad cap? I had a hell of a time finding just one; got it shipped free from RS for for like a dollar. On Saturday, March 28, 2015 at 12:46:24 PM UTC-4, MichaelB wrote: I have had this same issue with 3 of

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

By the way, I'm open to recommendations on a different clock kit that will use my IN-18s. I haven't had much luck finding another make. Kiran -- You received this message because you are subscribed to the Google Groups neonixie-l group. To unsubscribe from this group and stop receiving

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

Just an update for those morbidly curious... I replaced several parts per Nick's suggestion.. (in fact Nick was nice enough to send me the parts!) but in the end, the MOSFET is still getting super hot. So today I'm sending the board to Nick for him to poke at it. Thanks Nick! Kiran -- You

[neonixie-l] Nixies in Tomorrowland movie

https://lh3.googleusercontent.com/-6Q-ZOfe_dDw/VUT1sTQMjkI/A8k/QVbaqjIX8RI/s1600/tomorrowland.png I noticed this in the trailer for Tomorrowland. https://youtu.be/lWZ7O-RrATY -- You received this message because you are subscribed to the Google Groups neonixie-l group. To

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

message From: Kiran Otter kiran...@gmail.com javascript: Date: 05/14/2015 8:30 PM (GMT-06:00) To: neoni...@googlegroups.com javascript: Subject: [neonixie-l] Re: Need help with a tubehobby clock overheating Well after MUCH trials and tribulations.. I gave up. :) I lack

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

Niek, I don't see any problem with Q4, and it's been in there for 7+ years. If the recommendation is to replace it, I can do that.. the bummer is every time I need a cap or some other part, it costs a dollar plus another $6 to ship it. Sture, let me know if there's a way to test the inductor

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

Thanks Niek.. I'll try replacing those parts you mentioned. The IN-18s are socketed.. I wouldn't expect to have much trouble moving them to a new clock. I'd hope not, anyway. MichaelB.. I replaced C6 first, when I was having a problem with all of the tubes lighting up all sorts of numbers

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

Ok, I need some help to know which parts to order.. The inductor; I know it's 'inductance' is 270uh.. but what current rating? There's about 330 choices. :D I wish I could tell these things by looking at the schematic. Is

[neonixie-l] Re: Another found in buried box.....

I'd be curious what the insides look like. I had an Olivetti Programma 101 that used delay line memory. It was frightening the amount of electronics that were in that thing.. before any kind of ICs existed. http://www.oldcalculatormuseum.com/c-programma101.html It didn't even have a

[neonixie-l] Re: tubehobby enclosures?

It may not be entirely elegant but I used a hobby model display case for mine. Found one with a wood base I could bolt the clock to. Kiran On Monday, April 6, 2015 at 1:18:56 AM UTC-4, bani wrote: Does anyone make enclosures for tubehobby kits anymore? numinex is long since dead and gone.

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

I should have said if I see oscillation from the 7805 that Jeff mentioned, pointing to a bad C1. I may just replace it regardless. Kiran On Saturday, March 28, 2015 at 7:55:48 AM UTC-4, Kiran Otter wrote: Hi folks, glad to find this group! I've had a Tubehobby clock for several years

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

Well I finally got my scope out and gave my self a sort of crash course on how to use it. It's a 1975 Tektronix 475. Last calibrated in 1986. :D I found it on eBay about 10 years ago and it was cheap enough, I figured I could at least play with it and learn something. Bought probes and all,

Re: [neonixie-l] Re: An investigation into better ways to do cathode poisoning prevention - 1000 fps slow motion included

While I don't mind the slot-machine effect, I don't know how effective it is. My tubes only had slight poisoning when I built the Spectrum 18 clock 3 years ago, and now several have developed problems. Here's a video . I slowed it

Re: [neonixie-l] Re: An investigation into better ways to do cathode poisoning prevention - 1000 fps slow motion included

Oh btw, the tubes had about 16K hours on them 3 years ago. In the new clock they're on for 15 hours a day, for 3 years.. is another 16K hours, so they have about 32K hours on them. Kiran On Wednesday, April 11, 2018 at 1:58:51 PM UTC-4, Kiran Otter wrote: > > While I don't mind th

Re: [neonixie-l] Re: An investigation into better ways to do cathode poisoning prevention - 1000 fps slow motion included

When I built a new clock 3 years ago, I didn't keep the tubes in the same positions. However, there was one that was showing signs of poisoning and I swapped it with the left most tube at the time. Otherwise, they haven't moved for 3 years. Kiran On Wednesday, April 11, 2018 at 5:47:29 PM