Lots of ways to energize a relay after loss of (primary) power! You just need *secondary* power -- whether from a big cap or a "backup battery" that is busy trying to keep your VoIP gateway running during a short? power outage (and, just before it realizes it can't keep itself UP any longer, throws the relay before shutting down)
Again, if you've already got the electronics there doing other things, what is the cost of a few hundred bytes of ROM? (for the algorithm) You've already assumed the cost of the *relay*...
Positive. The cord is on the desk here -- sans handset and base!
Nobody sees the color of the carpet in the trunk of my car, either. Why didn't the manufacturer opt to put whatever he had lying around in the shop in there when he built the vehicle? I'm sure he could have saved a few pennies...
I also like all my tires "mounted white" or "mounted black" -- not some convenient mixture of the two. :>
Yup. That's how things are back East. All the utilities hang. And, each time a drunk buys a telephone pole, someone loses something for some period of time...
OK. I recall seeing banks of batteries. And some sort of
*motor* in continuous motion (I think something to do with ring?)I would *hope* so! It's been >40 years since I was there! :>
Ha! Yet, probably, still fully functional!