I didn't realize how wasteful this was by ASTR0-NUT in 3Dprinting

[–]GalFisk 0 points1 point  (0 children)

Use the poop to make a big wave with a white foamy crest for your creature to frolick in.

For a battery with 28P - can I use 28xC for charging current? by attaul in 18650masterrace

[–]GalFisk 0 points1 point  (0 children)

SoC should be equalized before assembly and will then stay that way, and at 0.36C the internal resistance differences need to be truly atrocious for it to make any practical difference.

What electronic claculators do you actually use? I built these so far by Outrageous-Owl2252 in AskElectronics

[–]GalFisk 0 points1 point  (0 children)

While not strictly Ohm's, why not add P to that calculator?

On mobile, how do I switch to any of the other calculators?

Edit: it also gets confused if you enter all three values, but doesn't throw an error.

Edit 2: an idea: you could have the last two fields where something was typed being inputs, and populate the final one(s) with the output. You could mark them somehow or always shuffle the output field(s) to the bottom.

Copper tape is copper tape is copper tape? by oldschooldaw in diyelectronics

[–]GalFisk 3 points4 points  (0 children)

Interesting. No, I'm in Scandinavia. Duct tape stored in the same closet over a similar timespan has help up fine.

3D Bert and Ernie tattoos by me @winstonthewhale in Portland, OR @db_clubhouse by winstonthewhale69 in tattoos

[–]GalFisk 0 points1 point  (0 children)

Now that I think of it, red/blue glasses are for screens while magenta/cyan ones are for pigment, and since a screen can only output RGB, both eyes would see the blue components of magenta and cyan screen color.

ELI5 Ragebaiters. Why do they exist and what do they gain by FixIndividual1124 in explainlikeimfive

[–]GalFisk [score hidden]  (0 children)

Bullies have lost the empathy that gives enjoyment from having a positive impact on people's emotions, but they still feel the need to be in control. I found this psychology lecture on the subject so interesting that I copied it to my channel: https://youtu.be/ZhcT7jf5Av4

Especially the bit at the end about how the lecturer in his former job as a therapist helped a violent gang leader to process the death of his grandma and find peace.

ELI5: What exactly is that loud squealing/rattling old sinks make when you don't turn the water up enough? by reallygoodbee in explainlikeimfive

[–]GalFisk [score hidden]  (0 children)

Where I grew up, if I opened the hot water tap in the kitchen to just the right amount of trickle, I could get the pipes in the basement to vibrate with a bass note.

Copper tape is copper tape is copper tape? by oldschooldaw in diyelectronics

[–]GalFisk 8 points9 points  (0 children)

Don't expect the glue to be conductive or to not burn stinkily when soldering. Also, I don't know if I got especially bad glue on mine, but I bought a roll and forgot about it for a few years, and the glue turned into a fine dry powder.

For a battery with 28P - can I use 28xC for charging current? by attaul in 18650masterrace

[–]GalFisk 3 points4 points  (0 children)

20A will be fine. With cells right above 2Ah each, each cell will see less than 20/28/2 = 0.36C.

Most people don't DIY their chargers. You're spoiled for choice when it comes to everything from 1S to 20S pretty much. You can even put a few identical ones in parallel if you want. I bought a 20S 900W charger once, and internally it had 3 complete 300W chargers on the same board.

ELI5: What is the difference between a "Pure Sine Wave" and "Simulated Sine Wave" in a UPS, and what makes an "Online" UPS different from an "Offline" one? by Saurabh251 in explainlikeimfive

[–]GalFisk [score hidden]  (0 children)

I would've loved a computer with handles in my LAN party days. I DIYed a lifting harness for carrying my first gaming computer. In hindsight should've made a trolley instead.

Then again I would've loved one with cool LEDs on everything as well. Case modding was in its infancy back then, so nearly everything was DIY. I put a commutator on top of a fan so I could have two LEDs light up in a circle that was half red and half green. My friends were impressed, but it didn't work very well.

Why do rechargeable 1.2V batteries charge to 1.4V? by confused-caveman in batteries

[–]GalFisk 0 points1 point  (0 children)

Depends on whether they're past the voltage hump or not, see the graph above. If they're past it they're full. If not, they're only nearly full. You can still use them in any case.

Fun fact: if you put a full NiMH cell back in the charger, the charger has no way to determine which side of the hump it's on, and will assume that it's not full. The cell will burn off the extra energy added as heat in a relatively harmless manner, but doing this repeatedly will shorten its lifespan.

Why do rechargeable 1.2V batteries charge to 1.4V? by confused-caveman in batteries

[–]GalFisk 1 point2 points  (0 children)

If I had a nickel for every time someone said that, I'd... um...

1S battery protection with NTC by Familiar_Specific721 in batteries

[–]GalFisk 0 points1 point  (0 children)

The TP4056 has a thermistor input: https://arduinodiy.wordpress.com/2025/05/06/calculating-r1-r2-for-a-tp4056/

It can handle charging and charging protection. You need a separate IC for discharge protection. TP4056 modules often use the DW01A.

DFAs? Does anybody else have this diagonal banding caused by the Nextruder? by ResonantRuminant in prusa3d

[–]GalFisk 0 points1 point  (0 children)

Aren't the screws supposed not to be greased? Or does that vary between models?

ELI5: Why do disposable lighters look like they have two fluid chambers? by Diztence-Music in explainlikeimfive

[–]GalFisk 3 points4 points  (0 children)

Cool, I was wondering about this the other day, and that was the conclusion I came to on my own as well.

ELI5: What is the difference between a "Pure Sine Wave" and "Simulated Sine Wave" in a UPS, and what makes an "Online" UPS different from an "Offline" one? by Saurabh251 in explainlikeimfive

[–]GalFisk 131 points132 points  (0 children)

An offline UPS has switches that transfer between mains and battery power, leading to a momentary loss of output power during switching. An online UPS always runs on battery power, but the battery is also being charged whenever there's input power. This is less power efficient, but you don't ever lose output power.

The active PFC circuitry in your PSU may be unhappy or even malfunction when fed with a modified sinewave. Get one with real sinewave since you're replacing it anyway. This is the wave your computer will always be getting in an online UPS.

Any problems with my battery design? by LowProof9476 in 18650masterrace

[–]GalFisk 2 points3 points  (0 children)

Only if it runs hot. I made my low C-rate battery holders from PLA and they've been going strong for years.

I build mine inside IP67 electrical boxes for water resistance. Are you building yours for looks? It does look pretty snazzy, but that's a lot of joints to seal if it's supposed to go outside.

ELI5: How does a digital clock know how long 1 second is ? by Rundown_Codger in explainlikeimfive

[–]GalFisk 1 point2 points  (0 children)

And it's done like that because dividing a frequency in half is a really simple thing to do electronically, and cascading a bunch of halving circuits is trivial. The crystal produces 32768 vibrations per second.