On Tuesday, May 10, 2016 at 1:48:52 PM UTC-4, jrehwin wrote: > > I've been working on Quincy's clock. I saw some serious squegging in the > high voltage power supply, and its switching MOSFET was overheating badly. > The filter capacitor was also warm. I tried powering the HV from a > Tayloredge supply, and it looks better but a couple of digits are still > misbehaving (blurry, more than one cathode lit at a time). I hooked an > oscilloscope to the clock and data inputs to the HV5530 driver chips. The > clock signal is nice and clean, but the data signal has a bizarre triangle > wave on it. I don't know if it's AC coupled in order to adapt the PIC > logic threshold to the HV5530 or what, I still need to trace out that > circuitry. The 12V power looks fine (there's a small amount of ripple on > it, but nothing objectionable), and the 5V power is clean. >
I don't want to go posting the whole NixiChron schematic here without some sort of consensus that it's OK (although I note that Jeff sent it to me on request way-back-when with no NDA), but here's the section showing the clock and data lines from the CPU to the HV chips. <https://lh3.googleusercontent.com/-Jv9Esn9apQk/VzKSlGjAVeI/AAAAAAAAABM/833miwKGKkcRgmO6XK5RFGrnwuAcnUG8ACLcB/s1600/5-10-2016%2B9-56-40%2BPM.jpg> -- 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/a9e39088-fa23-432c-bd4f-252f0ca1fbe0%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
