ChaoticNeutralCzech
@ChaoticNeutralCzech@feddit.org
- Comment on Switching out UPS batteries 8 hours ago:
That’s the problem. There will be no trickle current and the UPS will beep because it will detect battery removal.
- Comment on Switching out UPS batteries 9 hours ago:
You need a balancing BMS anyway and the UPS will not be able to charge it to what it thinks is 100% (about 15 V at trickle current) unless you trick it with a resistor (which wastes power of course).
- Comment on Switching out UPS batteries 12 hours ago:
What’s an “inui battery”? Do you mean the INIU B5 powerbank?
Powerbanks can be used directly as USB UPS devices if their output is enabled while charging but most devices you would power with them already have “UPS” functionality (built-in battery). By “disassembling them” you mean using their raw cells? That gets you 3.7 Wh per dollar but I recommend going for the similarly priced raw LiFePO4 cells unless you want to lug them around, getting you great longetivity and cycle life. You need a BMS anyway if you put them in series, I recommend a 4S or 8S config to avoid dealing with large currents and lossy step-up conversion. They can save you quite a bit of money if you charge them daily with solar power. Professional solutions are available, whether they are worth it depends on how much you trust your skills.
What UPS would you put the cells in, anyway? Don’t use one with a lossy and costly mains inverter unless you’re powering something that really needs mains. You can find many that have ATX outputs, or if you’re adventurous some ATX supplies can be run from 12V DC (exact!) supplied into the 12V rail and 5V into the 5Vsb rail because they use an inverter and buck converters to create all the other voltages from 12V. These can be identified by counting the mains transformers and windings of the main transformer. You can use the internals from a cheap car USB adapter (they work from 9 to 30 volts) for 5Vsb from your 4S-8S cell configuration, but the cell-voltage-to-12V supply will have to be a beast - still smaller than the mains inverter you’d need.
- Comment on We are only seeing 'the tip of the iceberg:' China's Salt Typhoon spies spotted on US govt networks before telcos, cybersecurity chief says 2 weeks ago:
Don’t get photographed in front of binary data, Braille signs, QR codes etc. you didn’t make yourself.
- Comment on Questions about the insides of this optocoupler (TLP250) 2 weeks ago:
It cannot be just a bridge, or else its output woukd stay constant regardless of input. There are other mandatory resistors missing in the diagram though.
- Comment on Questions about the insides of this optocoupler (TLP250) 2 weeks ago:
The triangle is an opamp. Its output (right) is the difference of inputs (left) (plus some small offset due to manufacturing tolerances) multiplied by a large number (million or more), capped to more or less the voltage of its power rails. In most uses, there is a feedback so the output influences inputs to equalize them, effectively creating an amplifier whose voltage amplification is set by rhe strength of the feedback. Without a feedback, the opamp’s output will be either GND or Vin depending on the which input’s voltage is higher. An opamp in this configuration os known as the comparator.
The rectangle looks a bit like a European-style potentiometer but it isn’t.
Maybe two outputs because DIP-6 packages are uncommon and they went for the standard.
- Comment on Elon Musk wants the U.S. to “Liberate the people Britain from their tyrannical government” 3 weeks ago:
Given his role in the upcoming cabinet, it’s no doubt going to be very cost-efficient and won’t increase the size of either government
- Comment on How Elf Girls Took Over Anime 4 weeks ago:
Everyone can set up a redirector to open YouTube links in their favourite instance. NewPipe and Grayjay open YouTube links automatically. It is way more difficult to do vice-versa because you’d need a list of instances or more detailed link analysis.
- Comment on Too dumb to understand where the gas tank opening is 4 weeks ago:
Nope, once the right-hand side pump got blocked by the black car she made it
- Comment on her favourite colour is blue :) 2 months ago:
It’s the girl’s fault for only being attracted to screaming ovals
- Comment on Huge win for Internet freedom: Google must sell its Chrome browser 2 months ago:
It’s been ruled in court. More details
- Comment on Huge win for Internet freedom: Google must sell its Chrome browser 2 months ago:
any technology company with enough money
I know, that’s the problem. They are all at least somewhat evil.
- Comment on Huge win for Internet freedom: Google must sell its Chrome browser 2 months ago:
To whom? Who will then fund Chromium? Also, what will happen to Firefox now Google can no longer fund 88% of Mozilla with their bribes?
- Comment on Time for a road trip 2 months ago:
- Comment on Time for a road trip 2 months ago:
Still avoids Scunthorpe. There is no good reason to visit Scunthorpe.
- Comment on Anon questions our energy sector 2 months ago:
Europe’s regulations are strict and robust. However, the German Greens convinced lots of people that they aren’t enough.
- Comment on nighttime pollinator gang rise up 2 months ago:
Various flowers, such as tulips, definitely hate moths.
- Comment on Stars 2 months ago:
I imagine if I were near Antares and looked the other way, it would very much look like night.
- Comment on Stars 2 months ago:
I like the corona though.
- Comment on Stars 2 months ago:
People have indeed thought this before telescopes. You’ll most likely see diffraction patterns around bright lights because of eyelashes and other imperfections, probably different for each eye but the same for all lights (technically, wavelength also matters but not really on this scale).
- Comment on Stars 2 months ago:
It’s always day if you’re a star. Or night?
- Comment on Stars 2 months ago:
Not really a bad question. The diffraction spikes have been corrected for.
- Comment on Spanish Notations 2 months ago:
¡Nobody expects the Spanish notation!
- Comment on NoStupidQuestions 2 months ago:
In a hospital I’ve been to, there is a skeleton poster by the MRI machine manufacturer (I think Siemens) that smugly says “without imaging techniques we wouldn’t know”. Apparently, it’s not just internet randos who forget. Too bad I can’t find it online.
- Comment on YouTube tests removing viewer counts — here’s what we know 2 months ago:
I don’t mind seeing vids with small numbers (many are genuinely cool) but I avoid 500k and above (except music) because the mainstream is mostly clickbait.
- Comment on M4 Mac Mini Power Button Has New Bottom Location 2 months ago:
Literally ISO
www.iso.org/obp/ui#iec:grs:60417:5988 - Comment on M4 Mac Mini Power Button Has New Bottom Location 2 months ago:
It’s a joke, note the conflation of port (physical connector) and port (one of 65536 virtual pathways for applications). Also, HTTP(S) (port 80 or 443 by default) is literally “Hypertext Transfer Protocol” so it’s fair to say it was designed to carry HTML.
- Comment on M4 Mac Mini Power Button Has New Bottom Location 2 months ago:
What is the
<–>port for? HTML? I thought that was port 80 or 443… - Comment on Read-onlys are cancer. Post stuff you want to see. 2 months ago:
There is an API you can use with
pythorheador other libraries to schedule posts very easily. @MentalEdge@sopuli.xyz uses it to automate loads of posts from his pic collections in local storage, and will gladly provide you with source code and assistance. - Comment on Waymo wants to use Google’s Gemini to train its robotaxis. 2 months ago:
It’s an LLM. Are they just going after buzzwords? I don’t want to talk with my car about what the best (paying most to Google Maps placement) pizzeria around is, I’ll decide that before the cab arrives. Just let me pick the address or coordinates and shut up.
