Yes, I realized my error shortly after I posted my reply. I'd like to see the schematic that decadecounter is using, as I assume the power supply is integrated on his PCB. Joe
On Tuesday, December 18, 2012 5:24:17 PM UTC-7, Michel wrote: > Reversing the diode would be a bad idea as the current will have > nowhere to go once the HV switch opens. What you could do is take an > ordinary AC transformer (say 240V primary 12V secondary), go from AC > to DC using a rectifier bridge and capacitor, then feed your 555-based > HV circuit out of this DC voltage. Then connect the +300V to the GND > of your circuit and you have a -300V where normally the GND would be. > Just be sure not to power anything else out of this secondary winding. > > Michel > > > > On Dec 19, 10:56 am, Joseph Bento <[email protected]> wrote: > > Jonathan, > > > > I'm going to hold off a bit on selling them. The more I look at the > clock > > on the decadecounter web site, the closer it resembles the single digit > > Nixie or VFD clocks I've built in the past. I'm going to try that basic > > circuit, and see what I can do with a 555-based switchmode supply. It > > would seem I might be able to reverse the diode as part of the -300 > supply. > > > > Joe, N6DGY > > > > > > > > > > > > > > > > On Monday, December 17, 2012 8:59:03 AM UTC-7, Jonathan wrote: > > > Joe, > > > > > I thought that once you met the oddball voltage requirements that > these > > > were easily driven with TTL logic levels? So your uC or whatever is > the > > > driver? > > > > > Wanna sell the ones you have? :-0 > > > > > Jonathan > > > > > On 12/16/2012 6:55 PM, Joseph Bento wrote: > > > > > That's the thyratron based 7-segment display? I have a set I > purchased > > > years ago from a US seller, and am still researching a suitable driver > to > > > build a clock. > > > > > I don't understand the practicality of such a display, or why the > Russians > > > developed this. Nixie and numitrons were already very mature at the > time > > > these were made. > > > > > Joe > > > > > On Thursday, November 29, 2012 9:10:03 AM UTC-7, Jonathan wrote: > > > > >> As the title suggests, I'd love to buy some of those tubes. Dang > john > > >> for linking to those tubes, they were just so cool I want some! > > > > >> Jonathan > > >>www.madlabs.info > > > > > -- > > > You received this message because you are subscribed to the Google > Groups > > > "neonixie-l" group. > > > To post to this group, send an email to > > > [email protected]<javascript:> > > > > . > > > To unsubscribe from this group, send email to > > > [email protected] <javascript:>. > > > To view this discussion on the web, visit > > >https://groups.google.com/d/msg/neonixie-l/-/qL4ASahwJPkJ. > > > For more options, visithttps://groups.google.com/groups/opt_out. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/Ss9NSlg-Pt8J. For more options, visit https://groups.google.com/groups/opt_out.
