It's not even a schematic error. Jeff used OrCad Capture, and Capture allows one to hide power & gnd pins. As long as they are named the same as the power & gnd nets, they get assigned to those nets and connectivity is established. They can also be made visible and assigned manually to any net, and there are other ways to establish connectivity.
And as Pete pointed out, the HV5530's work down below 5 volts, so no level shifters are necessary. This is not a design problem. I worked with Jeff on some projects -- he was a talented and skilled engineer. He knew how to use the tools. His designs were well thought out and implemented. Terry On Thursday, May 12, 2016 at 5:12:12 PM UTC-5, Nick wrote: > > On Thursday, 12 May 2016 19:30:12 UTC+1, Niek wrote: >> >> If that's indeed the issue, it's not surprising that the chip would break >> after a while, though it's still a little surprising that it would lead to >> this behavior. But I guess it's possible if the code isn't doing any sanity >> checks on the data it's receiving and perhaps even relies on it to >> determine when to stop writing into an array or something like that, >> overwriting other parts of the memory. > > > The MAX232 is powered - its a schematic error - in the older (original) > NixiSat the OnCore unit connects via J4 - the upgraded unit uses an > external Haicom HI-204III GPS puck that uses J3 and the MAX232 - works just > fine. > > The bottom line is that the schematic has problems, i.e. the lack of level > shifters, however that should not detract from the fact that Jeff made > wonderful clocks, and I for one am very grateful that I've had years of > pleasure from my NixiSat... > > Hopefully, it'll keep going for many more years yet ! > > Nick > -- 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/cafc7172-8c28-4679-b01b-c35a4a0940da%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
