My current clock went a bit overboard with self-checking; I have A/D converters on all supplies and software periodically monitors them for out-of-tolerance, and will shut-down the HV if that happens. There is also hardware-based detection of a gross power-supply failure that will instantly shut down the HVDC, just in case the RasPi crashed and cant monitor the supplies.
I was tempted to add a crowbar circuit that killed all of the supplies if an over-voltage condition occurred, but decided against that mainly because I did not want false triggers. The other reason is that if an overvoltage condition did occur, it's probably too late to save the clock because CMOS devices can get destroyed in nanoseconds if the zap is big enough. My main concern is the tubes; they are irreplaceable while the rest of the clock can be replaced. So, shutting-down the HV is sufficient. There's plenty of ac-line protection, and I'm fairly certain that's where most of the trouble would originate from that could cause the power supply to run amok. -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/c5b0cbcf-1917-4d03-a746-60537a99e2bb%40googlegroups.com.
