It counts on the digital displays, scrolls text on an LED display, shows characters on the LED Matrix between scrolling through all 64 dots. CRTs were one of the earliest displays so I used a CRT clock kit bought on Ebay. If anyone is interested I can send illustrated notes with schematics showing how each display is driven. Contact me private. Peter
On Thu, Oct 28, 2021 at 9:59 PM liam bartosiewicz < [email protected]> wrote: > > That looks really nice, what does it do? If you’re interested in > minitrons, you can find them in used avionic equipment. > > On Oct 28, 2021, at 1:26 PM, peter bunge <[email protected]> wrote: > > > Would anyone care to sell me an end view Numitron (DTF104B) to add to my > vintage digital working display? > I would also like a DIP 7 segment incandescent display, or anything > interesting not in the picture. Nothing too new. > The LED Bargraph and Magic Eye react to ambient sound. > <20210803_093913.jpg> > > > On Thu, Oct 28, 2021 at 1:41 PM Mark Moulding <[email protected]> wrote: > >> *Er, you're not the only one with a stash of these.... :)* >> >> I'm glad to hear that - it means that there will be other projects >> showing up with them. One of the reasons I like Numitrons so much, besides >> being incredibly easy to drive, is their longevity. At rated voltage >> (which I don't actually know for these tubes, but expect to be around >> 4.5V), they have a rated life of 100,000 hours, and that goes up rapidly to >> infinity at slightly lower voltages. There's also no cathode poisoning or >> other issues to worry about. This all means that I'm comfortable building >> something with the last of an unobtanium part, knowing that it won't need >> replacement in my lifetime. >> ~~ >> Mark Moulding >> >> On Wednesday, October 27, 2021 at 11:02:53 AM UTC-7 Pramanicin wrote: >> >>> Er, you're not the only one with a stash of these.... :) >>> >>> They are nice looking tubes... >>> >>> On Wed, Oct 27, 2021 at 10:50 AM Mark Moulding <[email protected]> wrote: >>> >>>> I have a pretty good sized collection of RCA DTF-104B Numitrons, which >>>> I think are especially attractive - they're large digits, in a flat-topped >>>> end-view tube. They're quite rare now, and in fact I think I have most of >>>> the remaining world stock of these things (around 150 or so). Although >>>> I've successfully used them in a couple of projects, I've never been able >>>> to locate a data sheet for them - does anyone have any pointers for this >>>> specific tube? >>>> >>>> Thanks! >>>> ~~ >>>> Mark Moulding >>>> >>>> [image: WoodClock (Small).JPG] >>>> >>>> On Tuesday, October 26, 2021 at 2:21:21 PM UTC-7 Dekatron42 wrote: >>>> >>>>> I knew I'd seen the number, and found them just now: >>>>> http://www.tube-tester.com/sites/nixie/dat_arch/Numitron_RCA_01.pdf >>>>> at the bottom of the page, they are development numbers for the DR2200 >>>>> series. >>>>> >>>>> /Martin >>>>> >>>>> On Tuesday, 26 October 2021 at 22:21:47 UTC+2 Dekatron42 wrote: >>>>> >>>>>> Tubes designated DTF are development numbers used by Apollo/RCA - it >>>>>> says so at the bottom of their datasheets. >>>>>> >>>>>> /Martin >>>>>> >>>>>> On Tuesday, 26 October 2021 at 21:43:52 UTC+2 Bartek Ogryz wrote: >>>>>> >>>>>>> Hi! >>>>>>> They appeared on eBay last days: DTF137, DTF138, DTF140 (or maybe >>>>>>> DTF/37, DTF/38, DTF/40). What are theese? Anyone has some more knowledge >>>>>>> about them? >>>>>>> >>>>>>> Bartek. >>>>>>> >>>>>>> BTW: If someone is interested in numitrons, quite rare Apollo >>>>>>> DA-2500 are hiding on eBay: item no 254866404573. Unfortunatelly, as the >>>>>>> seller told me, all that have left, are without markings... >>>>>>> >>>>>> -- >>>> 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 [email protected]. >>>> To view this discussion on the web, visit >>>> https://groups.google.com/d/msgid/neonixie-l/1baae699-e553-4f02-95f7-9b6b07cbee90n%40googlegroups.com >>>> <https://groups.google.com/d/msgid/neonixie-l/1baae699-e553-4f02-95f7-9b6b07cbee90n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >> 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 [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/297852cb-0da5-4396-9e67-f98fde319dfbn%40googlegroups.com >> <https://groups.google.com/d/msgid/neonixie-l/297852cb-0da5-4396-9e67-f98fde319dfbn%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- > 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 [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/CAFxqQo%2BJSdA9yFS9643rtwMG-iVhsT_%3DfU55uY26DVxUu1OvtQ%40mail.gmail.com > <https://groups.google.com/d/msgid/neonixie-l/CAFxqQo%2BJSdA9yFS9643rtwMG-iVhsT_%3DfU55uY26DVxUu1OvtQ%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > > -- > 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 [email protected]. > To view this discussion on the web, visit > https://groups.google.com/d/msgid/neonixie-l/6048A2A9-C804-4568-A36B-683B3920C482%40gmail.com > <https://groups.google.com/d/msgid/neonixie-l/6048A2A9-C804-4568-A36B-683B3920C482%40gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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