Something I want to note about how I used a heatsink; I epoxied it to the tops of the cases of M1 & U1; traditionally you'd bolt it to the back of the component but at the time I couldn't figure out a better way, and I had heatsink epoxy, so I just plastered it to the tops of the two components. It's been like that ever since I built the clock, and never did it get so hot that you couldn't touch it. Warm, yes.
I don't know how it could have become conductive across the cases of M1 & U1.. if it did, that's a neat trick. But removing it certainly seems to have made some difference. Using a laser temperature probe, M1 seems fine.. but U1 definitely seems cranky.. and it's heating the board up all around that entire end to ~110F. Again, I never noticed it getting this hot. To answer Johnk's question; the heatsink and epoxy weren't touching anything metallic, and I originally added it because I thought M1 & U1 were getting pretty warm from the start when I built it, and figured it wouldn't hurt to add it. But maybe over time.. it started to conduct between them somehow. I don't know. Jon; thanks for that info. I'll try one of the 7805 alternatives you mentioned. Nick; I'll drag out my scope and see if it even still works, and see if I can't check the 7805 with it. I might have a question or two on using the scope. :D So far, right now with a little fan blowing over the M1/U1 area.. the whole thing is keeping cool. Barely running above 90F anywhere I check. If I turn off the fan, it shoots up past 120F. I turned the fan back on at that point. Niek; I re-enabled the leading zero, and still see the same thing. In fact when going through the settings, I was able to catch the attached pic of the right most tube showing what was in the next-to-left tube. So it seems to go both ways. Kiran -- 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/508e5b80-f513-4cfb-9d71-8a46ab09022e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
