Virgin Physicists

Comments

• ArcaneGadget@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

  Welcome to the field of engineering! Your first lesson will be; “Tolerances and you”!

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  • lnxtx@feddit.nl ⁨3⁩ ⁨weeks⁩ ago

    +/-15 %? Good enough!

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    • rikudou@lemmings.world ⁨3⁩ ⁨weeks⁩ ago

      If it fits, great! If it doesn’t, you didn’t use enough tape.

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    • TheTurner@lemmy.zip ⁨2⁩ ⁨weeks⁩ ago

      As a calibration technician, this makes me hurt. Lol.

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    • squaresinger@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

      pi == 3

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    • Spacehooks@reddthat.com ⁨2⁩ ⁨weeks⁩ ago

      Cringes in Monte Carlo.

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  • nomecks@lemmy.wtf ⁨3⁩ ⁨weeks⁩ ago

    Pi is roughly 5.

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    • I_Has_A_Hat@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

      Never, in any engineering field, have I EVER seen anyone simplify pi to 5. For that matter, I have never seen anyone simplify to 3. It is always 3.14. I feel like pi simplification is a weird meme that people think engineers do but is never practiced anywhere.

      It’s like if there was a meme about chefs saying they always replace eggs with grapefruit. No they don’t, and it’s nonsense to think they do.

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  • GreatAlbatross@feddit.uk ⁨3⁩ ⁨weeks⁩ ago

    Second lesson: Pi is around 3.

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• barbedbeard@lemmy.ml ⁨3⁩ ⁨weeks⁩ ago

  Where are the spherical cows?

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  • Num10ck@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

    would be a great band name

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  • CaptainBlagbird@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

    No no no no, I think you got that wrong. Chickens are spherical, cows on the other hand are cuboid. And humans are cylindrical.

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    • MyFriendGodzilla@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

      Chickens, cows, and humans all are toroids. True story.

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    • svcg@lemmy.blahaj.zone ⁨3⁩ ⁨weeks⁩ ago

      Cowuuube!

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• Venus_Ziegenfalle@piefed.social ⁨3⁩ ⁨weeks⁩ ago

  The humble potentiometer:

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  • ChaoticNeutralCzech@feddit.org ⁨2⁩ ⁨weeks⁩ ago

    The least reliable resistor. Not to mention the trial-and-error getting it close enough to the target value.

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    • Spacehooks@reddthat.com ⁨2⁩ ⁨weeks⁩ ago

      linear potentiometer 100% pain, but Multi meter and rotary or digital potentiometer could be simple enough.

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• 21Cabbage@lemmynsfw.com ⁨3⁩ ⁨weeks⁩ ago

  I kinda wonder if there’s a specific reason for that number other than just being an ass.

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  • DragonTypeWyvern@midwest.social ⁨3⁩ ⁨weeks⁩ ago

    2pi

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    • a_wild_mimic_appears@lemmy.dbzer0.com ⁨3⁩ ⁨weeks⁩ ago

      would start with 6.28

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    • Siethron@lemmy.world ⁨3⁩ ⁨weeks⁩ ago

      Tau

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• TimewornTraveler@lemmy.dbzer0.com ⁨2⁩ ⁨weeks⁩ ago

  well there’s certainly none in the chip aisle

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• Aceticon@lemmy.dbzer0.com ⁨2⁩ ⁨weeks⁩ ago

  This is EXACTLY how it went for me when I moved from a Physics to an Electronics Engineering degree at University.

  Also, the trying to understand how the various circuits worked from the point of view of “electrons moving” was a hard to overcome early tendency (even simple things like LC circuits, for example, are only really understandable as ressonant stable states and for complex circuits you really have to go higher levels than “electrons” to be able to understand then in any reasonable amount of time).

  On the upside when we got to things like how tunnel effect diodes worked, the whole thing was just obvious because of having had an introduction to Quantum Mechanics in the Physics degree.

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• dejected_warp_core@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

  Watching people repair old electronics on Youtube has opened my eyes to the realities of real-world electrical engineering. In short: it’s all about tolerances.

  A power supply may have a nominal voltage of 5V, but anything from 4.8 to 5.2 is a-okay. Why? Because your TTL components downstream of that can tolerate that. Components that do 5V logic can define logic zero as anything between 0 and 0.8 volts, and logic one as low as 2 volts. That’s important since the whole voltage rail can fluctuate a lot when devices use more power, or draw power simultaneously. While you can slap capacitors all over the place to smooth that out, there’s still peaks and dips over time.

  Meanwhile, some assembly lines have figured out how to aggressively cost-reduce goods by removing whole components from some circuits. Just watch some Big Clive videos. Here, the tendency is to lean heavily into those tolerances and just run parts hot, under/over powered, or just completely outside the published spec because the real-deal can take it (for a while). After all, everything is a resistor if you give it enough voltage, an inductor if the wire’s long enough, a capacitor if the board layout is a mess, and a heatsink if it’s touching the case.

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  • UnrepententProcrastinator@lemmy.ca ⁨2⁩ ⁨weeks⁩ ago

    The way I got 100 in a lab once (electrical engineering) was by not using inductances in a frequency filter because their +/- is shit.

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  • psud@aussie.zone ⁨2⁩ ⁨weeks⁩ ago

    And your LEDs will last a lot longer if you remove one of those two resistors

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• captain_aggravated@sh.itjust.works ⁨2⁩ ⁨weeks⁩ ago

  You’re getting a 10 ohm resistor and liking it.

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  • Aceticon@lemmy.dbzer0.com ⁨2⁩ ⁨weeks⁩ ago

    More seriously, if you order it from an Electronics supplier, you can get a 6.2 Ohm resistor with a mere 1% tolerance (in some cases, even 0.5%).

    That said an EE and unless in very specific cases (such as reference resistors) would generally use a 10 or 5 Ohm one with 10% tolerance for any circuit that was supposed to be mass produced since it’s far cheaper and much more easy to source in the size you require.

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    • captain_aggravated@sh.itjust.works ⁨2⁩ ⁨weeks⁩ ago

      Electronics engineering is a bit beyond my scope; as an electronics hobbyist or field repairman you’re gonna get the closest I have in my kit at the time, I’ll probably get within an order of magnitude of the spec unless it’s somehow very damn critical or the schematic calls for one of the oddly common oddly specific values like 220 ohm.

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• bennieandthez@lemmygrad.ml ⁨3⁩ ⁨weeks⁩ ago

  just get a variable resistance, aka a potentiometer.

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• rumba@lemmy.zip ⁨2⁩ ⁨weeks⁩ ago

  They are, however, absolutely thrilled that the smallest resistor package is now ~ 1x the plank length on the narrow side.

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• Scott_of_the_Arctic@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

  Astrophysicists would be happy with a 1 ohm resistor.

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  • InternetCitizen2@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

    You should see their simplified periodic table.

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• Madison420@lemmy.world ⁨2⁩ ⁨weeks⁩ ago

  There is though. Iirc up to 15 digit subohm precision trimmed resistors are a thing just an uncommon and extremely expensive thing.

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• Venator@lemmy.nz ⁨2⁩ ⁨weeks⁩ ago

  Most physicists I’ve met would just use a 5.6 ohm resistor, or whatever they have on hand within an order of magnitude 😅

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