@stefano @pedro power line monitoring is important even for "normal" failures, because some are destructive.
Since 9/11 there are a few new spooky things, and one is modulating the power with pulses

@stefano that's impressive. meanwhile I accidentally stumbled on your website:
You have shared many useful items in a thoughtful way. I appreciate it, and am glad to let you know.

@jwildeboer I don't know about their new items, but I had the idea for "sound canon" before I saw theirs.
What I ended up using for my project at the time instead used multiple small speakers on the same baffle.
no big deal, who was I to pick a winner?