Thanks for the links! it's really cool to actually see these modules put to use. My current plan is to mimic the topology of the DC-112, and apply the modifications described for the DC-111. I'm thinking of using 3 phantastron oscillators to divide the 60 Hz mains by 15, 15, and 16 to get the 1/60 Hz for the minutes, because I'm not yet sure if I can actually get six matching trochotrons.
On Monday, December 5, 2022 at 10:34:22 PM UTC-8 Dekatron42 wrote: > I built a few clocks some years ago, both with the early DC106 modules > (tube and diode based) and the later DC111A/B modules (transistor and diode > based). Burroughs even described how to build clocks in some of their > datasheets where they showed how to eliminate some spade positions if you > wanted to count to any other number than from 0 to 9 and a clock was one of > their simple projects. > > To get a scale of six counter you can connect four consecutive spades > together just using one set of spade components and using them as the reset > signal to the flip-flop driving the Trochotron, it will then reset when any > of the combined spades are hit by the beam. Then you just need a simple > tube coincidence circuit for the hours portion to reset the clock to > 00:00:00 when it reaches 24:00:00 (you'll have to modify this for a 12 hour > clock though). Burroughs also combined two spades in two groups making the > DC111B count 0,1,2,5,8,9 so no extra reset signal was needed, the original > one from spade 9 was used - this way the beam skipped positions 2 & 4 + 6 & > 7, you just hooked up the Nixie like 0-0, 1-1, 2-2, 5-3, 8-4 & 9-5 > (Spade-Nixie#). > > You can see my original DC111A & DC111B modules here: > https://youtu.be/4x8fR1NGFVA (counting 0-9) & https://youtu.be/O-JPo_Se10A > (counting 0-5 with modification via two groups of combined spades). > > /Martin > > On Tuesday, 6 December 2022 at 03:13:16 UTC+1 LB wrote: > >> Hi everyone, >> >> I recently decided to begin designing a nixie clock with as few >> semiconductors as possible, and that has lead me to dekatrons and Beam-X >> tubes. I've never seen a clock that uses beam switching tubes, and I was >> wondering if anyone has any they would be willing to sell. I'll need at >> least 4 tubes in total. I'm looking specifically for the following types: >> >> - BX-2000 >> - BX-2004 >> - BX-1000 >> - (any electrically equivalent tube) >> >> There is a listing on eBay currently, but the tube in the product image >> has a big crack in the top, so that seems like a bit of a gamble. If you >> have any and are looking to sell, send me a PM. (Bonus points if you have >> the strange 26-pin sockets as well) >> > -- 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/04f34b01-ddbe-4ae6-8c1f-f579fd3719d0n%40googlegroups.com.
