Tim: >> Back in my youth, there were only two things using power at night in >> our house - an electric alarm clock and the fridge. Everything >> else had a real power switch that actually switched it fully off. Joe Zeff: > You can still do that today. Just plug everything into power > strips. > When you go to bed, turn the strips off. There are a few annoyances with that: The number of things that have a clock in them. Battery-powered phones that sit in a charger cradle (some cradled devices will leak and discharge the device sitting in them). And the sheer inconvenience, and mess, of having to trail cables around furniture so you can reach the switches. In my workshop I had all the equipment segretated into two outlets, one which was always left on (clocks, file server), and another which could be switched off (virtually everything else). That's a bit harder to do around the modern household. But sometimes even the older gear throws a spanner in the works. I had a musical instrument that was emitting a faint burning smell when switched off by it's own mechanical DPDT power switch. In a room full of electrical gear, that took a while to track down.' It turns out that the mains EMI filter is never out-of-circuit. The common-mode inductive filter is directly wired to the plug, if that has an insulation breakdown, it can go faulty while "switched off." There's a couple of ceramic caps across each pole of the power switch, if they leak, current goes through the circuitry, even while "switched off." And there's a cap across the mains behind the switch, which could be stressed if any of the caps across the switch are leaking. I replaced all the caps, and that seems to have cleared the fault. And I have to wait for the smell to dissipate to be sure. It lingers, but doesn't seem to be getting worse. If it does, the inductor is next on the list. -- uname -rsvp Linux 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@xxxxxxxxxxxxxxxxxxxxxxx
