What is the brand of the power supply you are using for this clock? Was the same wall wart used during both failures? Is it the same model of wall wart as your other clocks are using? Do you run another clock which has exactly the same PCB and design as the device of concern? Do you own an oscilloscope to look at the 12 V rail?
I suspect the issue is just failing/poor quality wall wart. I've seen cheap 12 V LED power supplies create spikes exceeding 16 V. Some time later the 16 V rated capacitor inside the PSU exploded. In your case, the NCH8200HV gave in first, for one reason and another. The absurdally large capacitor the designer recommended is meant to filter any garbage poor quality wall warts generate, but I think it's smarter to just invest in reputable wall warts and skip all of this nonsense altogether. My recommendation are Mean Well power supplies, they are not only reliable, but also electrically quiet. I used mostly GSM series. poniedziałek, 16 lutego 2026 o 15:43:11 UTC+1 Richard Scales napisał(a): > I've just tried one of those and for sure it works though I don't think > that USB-C with PD capability is as ubiquitous as some suggest. > For myself I prefer to distribute 12v from beefy 10A supplies to > individual clocks but that's only really because of the number I like to > display. > For regular folk I can see that USB-C-PD could work well. > > - Richard > > On Mon, 16 Feb 2026, 14:23 David Pye, <[email protected]> wrote: > >> I'm moving to try to power mine from usb-c as there are a range of >> autonegotiation boards that can request supply voltages from 5-24volt from >> a suitable PD PSU. >> >> David >> >> On Mon, 16 Feb 2026, 14:08 newxito, <[email protected]> wrote: >> >>> By the way, my attempt to make a similarly flat nixie power supply >>> failed miserably. I tried using the CJ5143-ALC flyback transformer which is >>> 4.6mm high. It worked somehow but I was never happy with my design. >>> >>> -- >>> 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, visit >>> https://groups.google.com/d/msgid/neonixie-l/2976622b-1c50-4cf0-804a-6a3d37c95346n%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/neonixie-l/2976622b-1c50-4cf0-804a-6a3d37c95346n%40googlegroups.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> > You received this message because you are subscribed to a topic in the >> Google Groups "neonixie-l" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/neonixie-l/myKhY_ZZl4Y/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To view this discussion, visit >> https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0F8Gm6prhsG6CYEdEh8NOi-dS94quk6-D%2BXh%2BH_jCsXkg%40mail.gmail.com >> >> <https://groups.google.com/d/msgid/neonixie-l/CAOQ6x0F8Gm6prhsG6CYEdEh8NOi-dS94quk6-D%2BXh%2BH_jCsXkg%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, visit https://groups.google.com/d/msgid/neonixie-l/b4020c35-b094-4407-9184-8dc4ade1009cn%40googlegroups.com.
