Niek, I do have a scope, however I'd be lying if I said I knew how to use it. I bought it used with the intention of learning how to use it, and it's sat since then. You could probably say I know enough about electronics to be dangerous. I know what resisters and capacitors and transistors do.. and I can somewhat read a schematic, but I wouldn't say I know much more beyond that.
That being said; I put my meter on the 7805 and there's a solid 5.042V coming from it. I then removed the fuse and measured the current across the fuse holder, and at most it peaked at 0.5A. I've now snapped the heatsink off; the epoxy never came in contact with the leads to U1 or M1. And now I think I've discovered that it's M1 that's getting hot, not U1. Going from the solder side of the board, with the heatsink, the board was much hotter behind U1 before.. but with the heatsink gone, I can hit the case of U1 and M1 with the temp laser.. and M1 is about 85F.. U1 is about 96F. Now I've increased the voltage to the tubes back to 170V (from 165V) and U1 seems maybe a degree cooler. I'm going to kick myself if all it was was this heatsink I put on.. plus I don't understand how it was causing such a problem. Here's a video of the numbers faintly lighting. In this case it matches the seconds. https://www.dropbox.com/s/3ex4b070e2r3s5p/2015-03-28%2019.52.58.mp4?dl=0 -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/e11614b2-f586-4216-bae1-ecff72417303%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
