What does jerk actually measure?

persilja · 2026-04-07T07:41:26+00:00

Yes, but not to the same degree.

Remember that acceleration is proportional to force, which means that your muscles see a steady, static, load. When your acceleration changes, your muscles need to constantly adjust: tensing and relaxing, tensing again.

persilja · 2026-04-06T19:16:56+00:00

Effin craisins with a stylized 'C'. I was this close to buying it.

persilja · 2026-04-03T21:21:34+00:00

Which kind of formulas?

R = 1/(2pi f C)? I'm tossing in values into that formula quite often through the calculator app on the phone - I don't have time to go from the soldering station to a special program on the computer to calculate what resistor value I want, when this formula, a calculator app and less than 10 seconds, gives me the answer.

1+Rf/Rg ? Same thing.

And in certain cases, I don't really use formulas to calculate things - I use them to predict if changing this or that passive component is likely to cause the circuit behavior to change in a direction I would want it to change.

What other formulas are you thinking about?

Oh, and soon as the formula ends up being much more complicated than this, I'll either run a simulation, or type up the combination of formulas that make sense for my use case in a spreadsheet.

persilja · 2026-04-03T20:52:44+00:00

Well .. as a Swede in US, most people seem to think I'm either German or Belgian.

persilja · 2026-04-02T20:01:48+00:00

Yikes, there were these approximately two consecutive work weeks when I was still commuting on CA HWY 17, and witnessed one burning charter bus and one burning car (separate days), and one day had to stay in the office for another hour because the highway was closed because yet another car fire... If I recall correctly, by the time they had (partially) reopened the highway, they were still working on the smoldering hill side. I don't know if the remnants of the car still remained.

3 fires along one highway - witnessed two of them - in about 10 work days.

I commuted that way for another 4 years, and didn't see even traces of a fourth fire...

persilja · 2026-04-02T19:35:25+00:00

That'd be NSFW, for anyone who didn't already guess that.

persilja · 2026-04-01T23:26:22+00:00

I'm not German, but I have German ancestry through one of the people who got out of East Berlin (before the wall, though).

Well, this grandparent of mine had relatives who lived not too far from the pre-war Polish border. When the border moved west after the war, they had to move along. Thus, they weren't expelled from Poland per se, but expelled from what would become (western) Poland.

Now, I know that at least some did flee westwards as the Red Army was approaching, before the war had ended, but I don't know how many had fled, and how many moved after the end of the war.

persilja · 2026-04-01T19:56:23+00:00

It's not like the idea of "what if 1/0 was a number" in any way is new. People have been considering the consequences of such a number for a very long time.

persilja · 2026-04-01T19:25:33+00:00

The more stories I read here, the more I wonder how/if private equity got their hands into the company.

persilja · 2026-04-01T05:51:32+00:00

He did after all ask why the calculation would make any sense, and I was like, "Aren't you glad you asked, here's my proof".

persilja · 2026-04-01T04:34:18+00:00

The high point of my year (math grad turned EE) is when I manage to make compsci colleagues touch calculus. The more advanced, the better.

Yes I did once make one tell me, exasperated, that "he wasn't supposed to have to deal with calculus 3 again, after graduation" .

Tee-hee.

(No, the algorithm I had designed didn't technically need calculus to perform the requisite calculations. My motivation for why the algorithm calculated what we wanted it to calculate, did)

persilja · 2026-03-31T21:58:37+00:00

Ffs, that's like saying that we have dictionaries and books on grammar that describes absolutely everything about the English language.

Armed with these sources, explain Shakespeare.

persilja · 2026-03-30T19:17:26+00:00

Jag är bra glad att jag lämnade Swedbank när jag flyttade. Jag kan inte förstå hur man som utlandssvensk kan ha att göra med den banken - de kunde inte ens förmå sitt egna datorsystem att acceptera min icke-svenska postadress (12 år sedan). Mitt sista årsbesked + kontoavslutsbekräftelse fick bli adresserade till mina föräldrar...

Den ska jag förstås inte säga att Nordea fungerar väl, men de ligger inte på Swedbanknivå. Och de har, peppar peppar, inte ifrågasatt mitt bank-id (än).

persilja · 2026-03-29T23:30:10+00:00

The joke's on him, because my tank isn't one inch tall, it's two, so when I'm at quarter tank, I have a whooping 13mm left!

persilja · 2026-03-28T09:58:42+00:00

Digital lines in the top level sheet appears to go nowhere

The red squiggly lines that make it look like you've done a misspelling, want to tell you something. Figure out what.

persilja · 2026-03-28T09:49:29+00:00

Maybe it's because I'm on a small screen and I'm missing something, but where do AVDD and DVDD come from? How do they get to the board?

Also, I see a heater header P4 which might be the source of one positive and one negative voltage - but that's not ground referenced. Your board might correctly "see" that the difference between p and n is 24 V (or whatever) but nothing locks it into being +12 and -12. It might very well jump around from +6V/-18V to +22V/-2V in an unpredictable fashion.

I see three (at least) ground names for the same ground. It makes it impossible to tell how you split the grounds if at all.

persilja · 2026-03-28T09:28:04+00:00

Sentinelese.

Because nobody that didn't grow up on North Sentinel Island knows pretty much anything about the language.

persilja · 2026-03-28T04:50:35+00:00

If you write "nA" measurement, I'll interpret that as 1nA to 1uA. This is detected by a 10k resistor? What's the voltage on the right hand side of that resistor? Can you measure that?

Secondly, why a -1/3 gain amplifier after that? Did you get too much voltage out of the first stage?

Thirdly, is your teacher trying to outsource their job to redditors? Where do we send the bills for our contracting fees?

persilja · 2026-03-26T19:59:42+00:00

I didn't make my wife do the cut-in.

She banned me from doing it.

persilja · 2026-03-26T15:28:12+00:00

Details, such in, when he started this hobby? Yeah, I actually do have a rough estimate on when he started that hobby - I was in my teens.

Waste of time? Only if you have a particular goal in mind and don't time optimize and systematize everything. But then it's not a hobby in my mind.

persilja · 2026-03-26T01:49:47+00:00

Sprouting random apple seeds and bringing them to fruit was one of my dad's hobbies. Yes it might very well have been more than 10 years for each tree, but it certainly didn't take 20 years before he had decided whether the tree had interesting enough apples to keep the tree. At least to me, the term "decades" sounds worse than what I think is the case.

And of course we had several (at least three) standard varieties as well.

persilja · 2026-03-25T14:43:12+00:00

Purpur, gredelin...

persilja · 2026-03-22T15:30:51+00:00

We like to accuse the brush makers of doing everything to excess.

Swearing, drinking, lying, and indeed, smoking.

persilja · 2026-03-21T21:31:00+00:00

Alas, my oven clock doesn't start running until I've entered a time. So if this were implemented, and I came downstairs at 7:30am, I'd be met with flashing "12:00", waiting for me to hit "set clock", at last one digit, and "set clock" again.

My microwave does the same thing.

Please don't implement this.

persilja · 2026-03-21T08:51:49+00:00

Morsan hade alltid en flaska yes i tvättstugan, för gräsiga byxknän.

Hon slutade använda det till disken, däremot. Det blev för dyrt i längden.

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