[neonixie-l] Re: 7971 nixie tube problem
I built one of these back in the early '70's. As I recall, it kept poor time, I suspect from noise in the power line getting into the clock chip. At the time, I lost interest and disposed of it. Grrr! Anyway, when an old-timer ham refers to "nets" he's referring to "On-Air" chat groups, not "On-Line". -- 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 to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/021bed35-cd94-4653-b2bc-29cb20c5f6e9%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: 7971 nixie tube problem
The clock uses an MM5314 in a multiplex configuration. That was ok when the tubes cost $2.50 each. I’d probably keep the clock in one piece, but long term it’s probably a good idea to replace the electronics with a direct drive circuit if running it full time. -- 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 to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/1aeca151-3700-40a5-9046-3baf094b8297%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: 7971 nixie tube problem
Most of my clocks use non-isolated AC-line voltage for the anode supply; as long as you follow good design and safety practices, you will end up with a reliable and more-efficient design compared to DCDC converters and transformers. It's very important to have properly-sized fuses, PCB traces, and wiring. Also, proper spacing, insulation, and warning labels (Hopefully my clocks will outlive me and someone will be taking care of them in the next century). Lastly, filtering from AC-line spikes and surge-protection. My first nixie clock has 4000-series CMOS gates tied to the AC line, and they have worked flawlessly for years. This was a design challenge I had wanted to do for many years; I knew it was theoretically possible but I had to prove it for myself. There are several stages of filtering, so the logic gates never see any of the ugliness that exists on the AC line at the wall-outlet. There are billions of devices that have circuitry running on the AC line without transformer protection; think of LED and CFL bulbs, and the input-side of laptop/cellphone power adapters. Not to mention the older tube-based radio/stereo/TV sets with hot-chassis. And most of these have UL, CE, etc recognition. --- Thanks for posting the 73 magazine; there's a certain magic about electronics from that era that doesn't exist anymore. Part of it is that you could touch, feel, and understand just about anything electronic back then. Not true today. -- 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 to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/a9b1c28e-747f-4e28-97e1-a50df47190a1%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: 7971 nixie tube problem
That's an interesting method of driving the anodes. W dniu piątek, 8 września 2017 15:12:38 UTC+2 użytkownik Robert L napisał: > > Complete 73 issue from July 76... See here: > > > https://ia902601.us.archive.org/31/items/73-magazine-1976-07/07_July_1976.pdf > > Caution... thread drift... > > Found the clock in the attached image on the local Craig's List back in > April... Seller and I each traveled a couple of hours to meet at the > farthest North BART station. Fun day... > > Rotary switch on the back of the clock has three positions... "fast > forward", "slow forward", and "keep time". Time is derived from the 60 Hz > line frequency. Could well be the same circuit from 73 Magazine. Can't > bring myself to harvest the tubes! > > 73 de Bob > -- 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 to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/6765f3a1-6678-448b-a925-3d690f7f2439%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: 7971 nixie tube problem
Complete 73 issue from July 76... See here: https://ia902601.us.archive.org/31/items/73-magazine-1976-07/07_July_1976.pdf 73 de Bob -- 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 to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/19067c76-c7ba-4e67-9a92-3c2ac575bc22%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: 7971 nixie tube problem
Just curious -- were they stored with exposure to anything that might cause pin corrosion -- thinking out loud here... Maybe that caused stress on the glass. Terry On Thursday, September 7, 2017 at 11:22:39 AM UTC-5, Clarke Payne wrote: > > I have run across some 7971s I have had stored for 30 yrs. 3 of the 12 > glass envelopes fractured when I picked them up. One just > disengrated.others seemed good cleaned up ok havent tested yet but appear > to be in sound shape. Anyone run into this problem. Any special precautions > before I test them? -- 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 to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/fcb2c053-0a8f-48d7-b94f-b36568d664b8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
