rtl-sdr uses the same chip as dvb-t tuners, but the everything else part is completely different

cancer is in large part an old people disease, if you avoided dying of cholera you’re more likely to die of something else. also now there’s a lot of people who were exposed to carcinogens decades back, and we got better at treating pr preventing some other common causes of death like stroke or heart disease

Lithium-iron is about 2x more expensive, there might be different availability and energy use during manufacture is probably higher

Lead-acid batteries work if you don’t care about weight and lithium-iron phosphate if you do

i’d still try hydrocarbon solvent first, because it’s least likely to damage it

almost certainly both will damage print. something like lighter fluid (or hexane) won’t, but it should loosen glue. trying to dislodge sticker with a razor sometimes works even better

some people suggest vegetable oil, but then you’re left with oily fabric

this also happens with dc once voltage is high enough

It’s easier to see that this circuit is rather symmetric when you redraw it

Then with both switches closed blue wire (the one in the middle) should only carry small current. If both halves are exactly the same it should be zero

In general when circuit doesn’t include nonlinear components (semiconductors most commonly) you can sum two valid solutions and you’ll get another valid solution. Note that when one switch is closed, current in blue wire goes one way and when the other is closed, in opposite way

50mm^2 for 125A, just under 8mm diameter solid copper rod if it was solid copper rod. but it’s stranded so it’s a bit bulkier than that, bundled five per cable. it adds up to some 4cm in diameter

split phase is 2-phase system but everyone else uses 3-phase distribution. in reality americans also use 3-phase distribution, this is where 207v 3-phase comes from (it’s 120v phase to neutral)

the entire point of three phase circuit is that you can split it into single phase circuits without using too much wire. usually block will be wired so that 1/3 of flats is connected to one phase, but if you need to power big loads like ag tools or something like concrete mixer three phase supply can be done (415V these days, there’s upward shift in voltage)

in EU there are really only two standards. for single phase loads up to 3.8kW, regular 16A plug is sufficient. above that, 3-phase 5-pin 32A plug (most common of them) is used which can deliver up to 23kW. there are common variants of 3-phase 5-pin plugs rated up to 125A that can deliver up to 89kW and uncommon up to 800A variants that are also part of the standard, but it delivers up to 0.57MW and it’s a bit silly

i’ve found 1999 version of iec 60309 standard and biggest connector defined there was 250A. actually i wasn’t able to find vendor for currents higher than 125A, but for 125A, standard expects 16 to 50mm^2 cable and for 250A 70 to 150mm^2. lower ends of these ranges would be insufficient for full load and would require limiting current appropriately. maybe higher currents were latter additon. either way 32A is almost-standard and anything above that is in some way custom job

modern smpss can take anywhere from 100 to 250V input so you can use them with either and any voltage inbetween. older ones had a switch between 240v and 120v modes (rectifier vs voltage doubler)

blame edison for that

We sorta do have universal mains connector (ignore for five minutes that there’s like 5 variants)

I’m guessing the walls are retaining some heat.

Guesstimate your own numbers, but the way my flat is built walls have heat capacity some 150x more than air inside. (reinforced concrete building, walls/floor/ceiling counted as half if shared with other flats) You will need to run a lot of air through, at at least couple C temperature difference, to make a dent in that

you’ll be lucky until you aint, then you’ll get banned for ban evasion

grey - 🇬🇧 english (traditional)

gray - 🇺🇸 english (simplified)

not sure but excessive caffeine can definitely make it worse

i mean technically it’s possible, you can show someone lab i guess there’s nothing extremely dangerous, not sure how it works legally, but the process is rather boring and we’re talking about a place that stores literal tons of piss why would you go there