@cmb@cathode.church

Cosmic Meow Background @cmb@cathode.church · Aug 03, 2026

hey #electronics #lazyweb, does anyone know a *negative* LDO that has sub-10µV rms output noise and is not from ADI?
i'm looking for parts that aren't as expensive as the analog ones and closest thing i got is TPS7A30 with 15µV rms

cathode.church

Cathode Church

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Cosmic Meow Background @cmb@cathode.church · Jul 31, 2026

me when a project has <5 power rails: i don’t understand why people use power modules, it’s so easy to do
me when a project escalates again: what do you mean 11 rails, fuck this shit. i wish there was a module for this…

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Cosmic Meow Background @cmb@cathode.church · Jul 31, 2026

TIL i can just type "−2=−1.22×(x+500k)/500k" in qalculate to solve for feedback resistors.

now i finally don't need to shuffle the equation around in my head anymore :3

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Cosmic Meow Background @cmb@cathode.church · Jul 31, 2026

one day i need to take inventory of my voltage references, but not today *puts ref54 sample baggie into drawer*
*finds ref70, ref80, adr1001 while looking quickly*

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Cosmic Meow Background @cmb@cathode.church · Jul 30, 2026

oh huh, the spice-crypt project is gone without any notice as to why...
there's still mirrors and debian has it but so strange.

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Cosmic Meow Background @cmb@cathode.church · May 06, 2026

saw a zirconium endmill which makes me think of the beryllium foil holder

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Cosmic Meow Background @cmb@cathode.church · Apr 28, 2026

Replying to @q3k@social.hackerspace.pl

@q3k just make sure it‘s far enough from the current tech blast radius, otherwise you might have to ask yourself the same question a few years later again

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Cosmic Meow Background @cmb@cathode.church · Apr 22, 2026

Replying to @lethalbit@chaos.social

@lethalbit@chaos.social *patpat*

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Cosmic Meow Background @cmb@cathode.church · Apr 22, 2026

Replying to @lethalbit@chaos.social

@lethalbit@chaos.social don't worry, i'll ping you for the next round, i need to fix a *lot* :D

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @equinox@chaos.social

@equinox@chaos.social it's already a part grave, i can fit in one more if it takes up less space than the discrete solution

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @equinox@chaos.social

@equinox@chaos.social well, i wanted to rip it all up anyways :D and better now then with a dremel later. and yeah, i can just use a load-switch and tie it to the fpga nrst to create that net, that's probably the best solution.

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @equinox@chaos.social

@equinox@chaos.social oh yeah, good catch, i definitely either mirrored the supplies once too often or once too few. thanks 😬 gonna update it real quick and push the fixed schematic.

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @cmb@cathode.church

and now with all the part numbers for JLC and generic added. the important DRC violations have also been fixed. just needs a round or two of checking everything and also cleanup.

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @ldcd@social.treehouse.systems

@ldcd@social.treehouse.systems i would probably go with the TPS7A3901 again, i've used it in such a design before and it's <1€ when sourced from LCSC

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @dlharmon@chaos.social

@dlharmon@chaos.social thanks a lot! yeah, definitely need to add a bunch more ground vias and i'll try to find a better cap for that one. i haven't quite started on full part selection yet and will keep that in mind.

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @gsuberland@chaos.social

@gsuberland@chaos.social later in the week is early enough, i'm probably not ordering before the weekend

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @cmb@cathode.church

pinging @lethalbit@chaos.social @azonenberg@ioc.exchange @gsuberland@chaos.social @sad_electronics@fosstodon.org 👉👈 if any of ny'all want to have a looksies i would appreciate it a whole damn lot but i also get it if not, it's a hot mess :D

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

Replying to @cmb@cathode.church

i would love to immediately just tear it all up and start over with layout and routing but if i have to do it one more time right now without a break i'll go mad :D: in any case, are you in the (greater) Munich area and want to play around with a prototype once it's produced? i'll bring one or two to @fafo@social.fa-fo.de and if everything goes well also to the open hardware summit in berlin. in like a month.

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Cosmic Meow Background @cmb@cathode.church · Apr 20, 2026

hey #electronics fedi, anyone wants to do me a solid and glance at the Glasgow Interface Explorer revD design at https://codeberg.org/tachiniererin/glasgow_revD ? it's just a prototype pass right now and i know the layout and routing is far from optimal, i'm just trying to find any show-stoppers so that we can start with testing.

edit: i've gotten enough findings by people in the meantime to warrant enough changes and a re-layout, thank you all!

cathode.church

Cathode Church

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Cosmic Meow Background @cmb@cathode.church · Mar 28, 2026

„born to shit, forced to sputter“ lives rent free in my head and i hate it (was on the topic of sputter coater)

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Cosmic Meow Background @cmb@cathode.church · Mar 28, 2026

Self-OH: "that's LLM stealthing"

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Cosmic Meow Background @cmb@cathode.church · Mar 28, 2026

Replying to @true_facts@cathode.church

@true_facts@cathode.church good question, depending on what is getting fried there’s different power sources that can be used to achieve thorough heating.

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Cosmic Meow Background @cmb@cathode.church · Mar 28, 2026

„honey, i bought a new deep fryer, it even came with free oil!“

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Cosmic Meow Background @cmb@cathode.church · Mar 26, 2026

Replying to @cmb@cathode.church

just got offered an emco cnc lathe with tools but broken controller for 300€, send help (it‘s in the first upper floor, no cargo lift)

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Cosmic Meow Background @cmb@cathode.church · Mar 26, 2026

dismantling an old semiconductor research lab is a weird experience. old photos and documents from before the internet existed that make you feel strangely nostalgic next to a refrigerator which has kept toxic chemicals at temperature for the last 30 years.
that and shitloads of vacuum fittings.

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Cosmic Meow Background @cmb@cathode.church · Mar 25, 2026

Replying to @crystalmoon@chaos.social

@crystalmoon@chaos.social this here: https://en.wikipedia.org/wiki/Carbon_tetrafluoride R14, an old refrigerant gas

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Cosmic Meow Background @cmb@cathode.church · Mar 25, 2026

doing @fafo@social.fa-fo.de logistics, looking at what stuff from the lab we should take.
big ass bottle of carbon-tet in the corner.
yeah, not taking that one.

edit: sorry, false alarm, it’s the wrong tet. tetrafluoride not tetrachloride.

social.fa-fo.de

FAFO Updates (@fafo@fa-fo.de) - FAFO e.V.

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Cosmic Meow Background @cmb@cathode.church · Mar 23, 2026

let's see if this sense resistor layout (https://www.analog.com/en/resources/analog-dialogue/articles/optimize-high-current-sensing-accuracy.html) makes a difference with generic current sense resistors

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Cosmic Meow Background @cmb@cathode.church · Mar 23, 2026

Replying to @Thunderbolt93@chaos.social

@Thunderbolt93@chaos.social oh routing isn't the issue, it's placement. routing will be easy once i place everything in a way that it all falls together.

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Cosmic Meow Background @cmb@cathode.church · Mar 23, 2026

Replying to @cmb@cathode.church

2441 pads, 1633 unrouted. ye gods what have i done...

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Cosmic Meow Background @cmb@cathode.church · Mar 23, 2026

the question as old as PCB design: "will it fit or won't it"

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Cosmic Meow Background @cmb@cathode.church · Nov 20, 2025

Replying to @krans@mastodon.me.uk

@krans@mastodon.me.uk it does, but its questionable if that’s more or less effort

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Cosmic Meow Background @cmb@cathode.church · Nov 20, 2025

Replying to @leo@60228.dev

@leo@60228.dev there‘s an ultralibrarian part so i‘ll start with that while double checking every single dimension

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Cosmic Meow Background @cmb@cathode.church · Nov 20, 2025

Replying to @cmb@cathode.church

or... maybe run away screaming after all, hmm...

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Cosmic Meow Background @cmb@cathode.church · Nov 20, 2025

sometimes you just gotta push through and face the fact that it's not going to be easy

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Cosmic Meow Background

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