New Google Classroom update makes it harder to cheat on quizzes | 25 Amp Circuit Breaker

Overall though, if everything is designed so it can’t hurt you, even in far fetched and unlikely worst case scenarios then many things would just never get made. In this case I think you could make a safe heated bed as long as you take safeguards to ensure a low probability of accidental shock. A simple enclosure around the board and the connections would more or less end the shock safety debate. Fire is another issue I guess, probably a fuse would solve that.

Power Supply Plan 24 Volts 300Watt heatpad or higher : Saferhttps://hackaday.io/project/8680-power-supply-plan-24-volts-300watt-heatpad

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Also power the unit directly from the mains ( http://ww1.microchip.com/downloads/en/appnotes/00954a.pdf ) with the ability to power the unit directly with DC when (re)programming the ESP8266

I’ve been using a relay to switch a 1000W pump. http://telecnatron.com/articles/ESP8266-WIFI-Remote-Controlled-Mains-Switch/index.html

It’s been a week and I am almost constantly having to keep the car charging while at home just to keep up. On my previous L2, I charged every 2 to 3 days. My first problem was the outlet closest to the driveway shares the circuit with the family room. Oops, popping the breaker every time. The front of the house outlet wasn’t any better. Luckily there is a basement outlet I can drive to and get a charge with no issues.

110/220 is the load rating and 120/240 is what the circuit provides. The voltage could sag as low as 110 or 220 in use.

Far as I’m aware, you’re supposed to get a qualified person to fit an electric cooker. Of course, doesn’t stop me doing it. Actually more complicated than you think, it’s not just 3 terminals, there’s a dozen bits of plastic and metal in there that all need putting back in the right order.

Does matter since he runs it on DC, even so the lamination are already welded at the factory, its how the transformer is assembled.

In the case of an opto-couple my ‘rule of thumb’ is for the min to be the distance between the pads on left and right rows of pins. ie nothing under the opto at all apart from the pads connecting the pins.

And this AC vs DC case when it comes to skin effect, is a reason for why some Data centers use DC distribution, as most server products uses switch mode power supplies and therefor has an internal bridge rectifier.

I’ve thought about converting my Solidoodle 2 to 120v bed heating for ages now. I think it’s a good idea with a lot of benefits. I’ve been far to lazy to actually do it, however. Maybe one day I’ll get my act together. In the mean time I’ll just sit here and envy other people who have had the initiative to actually do it.