Glad you liked it - was my first venture into designing my own clocks. I haven't posted a schematic, but there isn't really much to it in hardware. The tubes are driven by single transistor voltage-controlled current sinks which are run by an octal DAC controlled by a PIC. The rest is just HV generation, managing the RTC and USB interface etc. The complexity is in the software rather than the hardware (in part because that's my background!). Grahame has also built a similar single digit clock using IN-13 and the same octal DAC. The step down animation doesn't use any clever hardware like you suggest in the other post - all the effects are done in firmware. Sleeping sickness refers to the observation that you won't be able to light the full length of the tube with the rated current when you receive it from the supplier. Storage results in some kind of aging of the cathode surface which makes them resistant to glow. You can burn it off with over-current treatment, but not all tubes recover satisfactorily. My sense is that the effect hits IN9 argon > IN9 neon >> IN13. Cheers, Jon.
On Wednesday, November 28, 2012 11:12:22 PM UTC, Michel wrote: > That is an interesting display Jon, thanks for the info and link! How do > you make the step down animation? Did you post a schematic somewhere of > this clock? The sleeping sickness is probably related to the part of the > tube that is not lit? I mean, in your clock setup this wouldn’t really be > an issue, right? > > > > Michel > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to neonixie-l@googlegroups.com. To unsubscribe from this group, send email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/1ZLVDwwmhsYJ. For more options, visit https://groups.google.com/groups/opt_out.
