> Quincy, were you able to fix your clock? It may be helpful to make a little > video and post it on YouTube so that we get a better idea of how it's > failing. Also, try it with and without the GPS plugged in, and try reseating > the MCU as suggested. Also take some close up pictures of the circuit board > (front and back) so we can check if anything looks suspicious.
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. - John -- 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/A412144F-DA1C-4817-8D9F-512AFA0685BF%40mac.com. For more options, visit https://groups.google.com/d/optout.
