[neonixie-l] HP 1820-0092 nixie driver
I uploaded a 'datasheet' to our shared drive that I put together for the HP 1820-0092 BCD to decimal decoder, HP's version of the 74141/K155ID1. It shows the pin definitions and truth tables for the converter. https://drive.google.com/open?id=0BxM1hw8V6l8QOWZkZmxreGFDcEk Could a mod move it to a suitable location? BTW Could a mod also move this document to a permanent location https://drive.google.com/open?id=0BxM1hw8V6l8QcUxxdEtQQ0dqU1E ? -- 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/4d554ecd-55de-4635-b4f3-a3d8acd1383b%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.
Re: [neonixie-l] 7971 nixie tube problem
That vintage clock is interesting indeed. Built from a 1976 article in 73 magazine. You can read part of the article. The author discusses the voltage rating of the transistors, notes that he has no data ... and "inquiries among friends and on the nets failed" On the nets? Was that perhaps ham radio lingo in the 70's? Or was he portending the future? Also, he paid $5 for the 6 nixies and the driver boards. Terry On Friday, September 8, 2017 at 6:11:47 AM UTC-5, Paul Andrews wrote: > > The same seller has an empty school display board for sale that takes 15 > of those tubes, so he picked up two of them? > > There is also this clock with six tubes in it that I am surprised is still > for sale: https://www.ebay.com/itm/122680353656 > > (Sorry, don't mean to hijack this thread) > > -- 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/4e179550-0ceb-4612-bf7b-f111e9315fec%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [neonixie-l] 7971 nixie tube problem
The same seller has an empty school display board for sale that takes 15 of those tubes, so he picked up two of them? There is also this clock with six tubes in it that I am surprised is still for sale: https://www.ebay.com/itm/122680353656 (Sorry, don't mean to hijack this thread) -- 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/aa4d8415-a8cd-408e-b691-a7a7bc9c4d1f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
