cross-posted from: https://lemmy.world/post/27589038
this post was submitted on 02 Jul 2025
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Use 2 E192 in parallel: a 6.19Ω resistor with a 4500Ω resistor. This gives 6.1846Ω which is close enough for rock and roll.
I feel like this is one of those comments I want to hoard in the off chance that I ever get into this and start building shit but I know deep inside me that's never gonna happen.
For you and anybody else wondering, the GP is a joke and should not be taken seriously.
The reason there isn't a resistor with the value on the meme is because real resistors have error tolerances and are never the exact value on their marks. If you go assembling a card-castle of resistors with the wrong value so that the labels add up to the value you want, you will still have a resistor of the wrong value.
There's an old saying that engineers measure with a micrometer, mark with a grease pen, and cut with a hatchet. You do the math right first, check the tolerances and tools at hand, then you try whatever seems like it'll work keeping room for your second and third guesses. Never give the boss their company credit card back until you're pretty sure you won't need another hardware run of the day.
Still, it's useless to try to get a board of the right size by nailing together boards you've cut wrong. You throw it out and try to make a better cut on the next one.
The actual method for calibrating exact resistor values involves starting with a lower resistance and etching away parts of it with a laser to get to the exact value you want. You probably still couldn't get as many decimal places as OP tho
And then in a week it drifts into a different value and you have to calibrate it again.
And that's assuming your room temperature is controlled for all experiments.
And that's also assuming the current going through it is 0 so it is always exactly at room temperature.
Virgin theoretical physicist vs Chad experimental physicist goes brrr
For really sensitive applications like voltage references, they actually build a little enclosure around the part with a built in heater to keep it at a constant calibrated temperature. The boards also often have cutouts to reduce thermal transfer and things like the board flexing causing stress to the part.
The resistor itself won't really drift at a constant temperature, especially in a sealed environment where condensation, corrosion, and dust aren't a factor.
Though of course real programmers use vim
Emacs or die
Emacs means die. Vim4lyfe
I just raw dog it in Pico most of the time.
How?? Muscle memory fails me every time
I only ever used it in command lines. And use other simple IDEs (Textmate and a bunch of custom bundles on a Mac…) occasionally Atom based IDEs for some embedded electronics too, but only really as a hobby.
As a layperson, what happens if crumbs from my sandwich fall all over your chad experiment setup?