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#electronics

67 posts64 participants0 posts today
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niconiconi

Wrote more #openEMS documentation. The math notes on the old project wiki need cleanup. The equations were written in absolute permittivity and angular frequency, while the software expects you to enter a relative permittivity and ordinary frequency, making it a cross-reference headache. ​:woozy_baa:​ I'm pretty sure the Debye formula is now correct, but I still need to check the Lorentz model. #electronics

Math Notes ================== Debye Model """""""""""" The Debye model is defined by the following formula. .. math:: \begin{align} \epsilon_r(f) &= \epsilon_r(\infty) + \sum^N_{p=1}{\frac{\Delta \epsilon_{r,p}}{1+ j (2 \pi f) t_\mathrm{relax}(p)}} - j \frac{\kappa}{2 \pi f} \\ \end{align} where: * :math:`f` is the frequency. * :math:`\epsilon_r(f)` is the material's relative permittivity. * :math:`\epsilon_r(\infty)` is the material's relative permittivity at :math:`f \to \infty`. * :math:`\kappa` is the material's electric conductivity. * Note that electric conductivity :math:`\kappa` is not to be confused with material permittivity, which is sometimes also denoted by :math:`\kappa` in the literature. * :math:`p` is the index of the model term currently being evaluated, with up to :math:`N` number of terms in total. * :math:`\Delta \epsilon_{r,p}` is the p-th oscillator strength. * :math:`t_\mathrm{relax}(p)` is the p-th relaxation time.
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DoomsdaysCW

#UK - The Restart Project! Lots of locations, lots of dates!

"The Restart Project aims to tackle the climate emergency by making #electronics work for people, for the planet, and for longer.

"We’re a people-powered social enterprise that believes every product should be repairable, and that repair and reuse should be accessible and affordable for everyone.

"Right now, we live in a throwaway economy. It can be tough to find options for repair locally, and electronics can be needlessly hard to fix. As a result we’re losing repair skills in our communities, throwing more away, and buying more new. It’s building a mountain of e-waste while using ever more of our planet’s limited resources.

"That’s why we make repair easier for everyone.

We help people run repair events in their communities where they teach each other how to fix their broken and slow devices – from tablets to toasters, from iPhones to headphones. We run fixing factories that help people repair their things, build repair directories where people can find help near them and train people in repair skills."

therestartproject.org/networks

#RepairCafes #RightToRepair #BuildingCommunity #ReduceReuseRepair #ReuseRepair
#RepairCafésUK #SolarPunkSunday

Public
Calishat

#trees #electronics #sustainability

'A waste gum produced by trees found in India could be the key to unlocking a new generation of better-performing, more eco-friendly supercapacitors, researchers say.

Scientists from universities in Scotland, South Korea and India are behind the development, which harnesses the unique properties of the otherwise useless tree gum to prevent supercapacitors from degrading over tens of thousands of charging cycles.'

gla.ac.uk/news/headline_117059

www.gla.ac.ukTree gum supercharges supercapacitor lifespan, research revealsA waste gum produced by trees found in India could be the key to unlocking a new generation of better-performing, more eco-friendly supercapacitors, researchers say.
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kopper

electronics fedi i need your help.

so i have these headphones that have been broken for years now and want to see if i can repair them. the issue as far as i've been able to tell is these solder joints (pictured) are broken and not properly connecting.

how hard would it be for someone who has never even breathed in the same room as a soldering iron to go about this? can i just buy the cheapest junk soldering iron and solder online and make it work? what do i need to know before attempting this?

(before you pledge allegiance to your favorite solder brand or send amazon US links my way let me clarify i am reasonably confident none of the brand names you recommend will either be available to buy over here or as cheap as you expect)

#electronics#repair
Public
Calishat

#electronics #hardware #EWaste

"Those well-meaning agitators at the Public Interest Research Group (PIRG) are back, this time with an interactive "Electronic Waste Graveyard" cataloging a range of devices tossed aside after software support expires or cloud connections flatline.... its latest effort is an online 'rogues' gallery' showcasing more than 100 tech products that no longer function properly or were effectively junked after manufacturers ended support."

theregister.com/2025/04/11/ele

The Register · PIRG's 'Electronic Waste Graveyard' lists 100+ gadgets dumped after support vanishedBy Dan Robinson
Continued thread
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⚡🔌ℂlaire 𝔻anielle ℂassidy♾️

Some numbers. $2,500 is left on our fundraiser. We're halfway. I'd freaking love to hit that.

But if we can't, bare-bones I need $300 for a generator rental (we are off-grid and fully self-powered. More funds and I'll do bigger solar this gear), $100 for educational decor, and I pulled $700 from my (meager) savings for poorer campers already.

$1,100 would do a LOT.

gofundme.com/f/there-u-glow-ra

Two people dressed in femme outfits leaning in opposite directions each helping two younger kids with a soldering project on folding tables outdoors in a pop-up tent. Behind them hang colorful posters talking about electronics.
A woman in an aesthetic outfit is standing in front of a large group of colorfully dressed people showing off something on an iPad. Behind her are various glowing LED projects.
A glowing blue tent with a rainbow sign at the top that says "There U Glow" at the top has green overlayed text. The text reads "An all femme and queer founded, designed and run electronics camp in Portland, Oregon We are aggressively grassroots and rudely dedicated to femme folks who are freshly interested and/or fiercely expert in technical skill. We kick ass and open our source in equal measure. Keep track, we won’t stop." At the bottom is "www.thereuglow.club"
#womeninstem#TechNews#TechTrends
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Graham Sutherland / Polynomial

people who have experience doing high current (on the order of 400A) things in a professional context - I'm looking for info on good practices when bolting DC bus bars together. washers between mating surfaces, or just on the outside? bolt sizes and torque specs? do practices change for aluminium versus copper?

context: parallel array of low voltage DC supplies feeding high current loads. non-commercial deployment. no advice needed on the safety & electrical side.

#electronics#electrician
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