𞋴𝛂𝛋𝛆 @ j4k3 @lemmy.world

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Birkeland–Eyde seems quite scalable and accessible. Like just lightning in a bottle. A few solar panels and an old automotive ignition coil, CRT TV transformer etc.

There is Ostwald and Birkeland–Eyde

fork mommy

Fast and Furious n +1

AI alignment is authoritarian now in a very dangerous way. That combined with drones is what scares me. Without reasoning AI is far more dangerous. Politics is pushing it that direction and it will turn on us. Normalizing authoritarianism is mass murder of future millions.

nitric acid and cellulose or most organics. I'm sure there is a relatively simple way to get from liquid nitrogen to nitrogen compounds. Air is mostly nitrogen. Two air conditioner compressors can work in series to with the second running ethylene glycol IIRC to get low enough to liquefy air for nitrogen. It probably only takes something like hydrochloric acid and a few steps to get somewhere useful. Probably written in a high school chemistry textbook.

There is an issue of some kind where the current limit is not reliable and requires additional circuitry. I think GreatScott YT was who went into that one.

Pin pitch is ultimately the spacing between traces. The traces are not as big of an issue as the actual spaces between the traces. This clearance is where things get tricky with making printed circuit boards. The process of masking off some circuit is not that hard. The way the stuff you want to keep is isolated from the copper you want to remove is the hard part. One of the issues is that you need an acid to take away the copper, but not the mask, but copper has a thickness. As the copper is etched away the acid moves sideways into the thickness too. Copper never etches completely uniformly either. The larger areas of open copper that need to be removed will etch much faster than a bunch of thinly spaced gaps. One of the tricks to design is finding ways to etch consistently with the process you build.

If you want to make super tiny traces that still have the right amount of copper and have all the gaps etched away consistently, the process of the etching toolchain becomes more expensive. You will need a stronger acid with a very good way of removing the etchant that is close to the copper and loaded with copper already. This is usually done with a stream of small bubbles, but it is risky because it could impact the adhesion of the masking material over the traces you want to keep. The stronger, hotter, and now agitated acid requires that the copper clad board is extremely clean and the photoresist used to mask the stuff you want to keep must be a very high quality. Also the resolution of this photoresist requites a much more precise form of UV exposure and development (about like developing old film photos).

So you need a better mask development toolchain, better quality photoresist. You might get away with not using photoresist at all in some other cheaper low end processes. You need the highest quality copper clad that etches more evenly, and you need a stronger acid to etch quicker straight down because a slower acid will move further sideways and ruin the thin traces to keep.

The pic has old school dip chips in a static resistant foam. Those are the classic standard 1/8th inch (2.54mm) pin pitch. The easiest types of boards to make yourself are like the island soldering style board with the blue candy soldered on. That is a simple coalpits oscillator for testing crystals. Then there are protoboards like the homemade Arduino Uno pictured. Then you get into the etched boards. Some of these were done with a laser printer toner transfer method. That is like the least accurate DIY and somewhat analogous with the cheapest boards from a board house. Others were made using photoresist. This method is more accurate but involved and time consuming. One of the boards pictured is a little CH340 USB to serial board with a USB micro connector. That is getting close to my limits for etching easily. Another board has a little LCD and text. There is a small surface mounted chip pictured on the foam and that is a typical example of what kinds of pin pitches are common for the cheapest level of board production. Now there are two USB-C female connectors pictured. One has a larger pin pitch and is made for USB 2.0 connections and power. However, that other one with all those tiny tiny connections at the back – that is a full USB-C connector. That thing is a nightmare for tiny pin pitch. There is also a USB-C male connector with a little PCB attached. These are the types of solutions people have tried to come up with where only some small board is actually of a much higher resolution. It is not the best example but I'm not digging further through stuff to find better.

The actual pins on the little full USB-C connector are inverted to be able to flip the connector. There is a scheme present to make this a bit easier to match up the connections but it is still a pain in the ass to juggle everything around. All of the data trace pairs are differential too, which basically means they must be the same length between the source and destination. So any time they are not equal, the shorter trace must zigzag around in magic space you need to find just to make them even.

Not unless they want to go bigger. The USB-C pin pitch is too closely spaced for the lowest tier of printed circuit boards from all major board houses.

You might have some chargers get deprecated eventually because there are two major forms of smart charging. The first type is done in discrete larger steps like 5v, 9v, 15v, or 21v. But there is another type that is not well advertised publicly in hype marketing nonsense and is somewhat hit or miss if the PD controller actually has the mode. That mode is continuously adjustable.

The power drop losses from something like 5v to 3v3 requires a lot of overbuilding of components for heat dissipation. The required linear regular may only have a drop of 0.4-1.2 volts from input to stable output. Building for more of a drop is just waste heat. If the charge controller can monitor the input quality and request only the required voltage for the drop with a small safety margin, components can be made smaller and cheaper. The mode to support this in USB-C exists. I think it is called PPS if I recall correctly. A month or two back I watched someone build a little electronics bench power supply using this mode of USB-C PD.

Head shape matters. I only wear sports stuff for cycling and do not care what others think of that. My old Smith's saved an eye once. I only like to ride with frameless because roadie. The cheap Chinese NRC frameless are half decent. They have a full range photochromic version and their plasma metal sputtered coatings are good quality, but the lens shape is a basic flat. People think they are high end but mostly due to my other older riding gear that is very high end. Still, when casual I wear aviators.

eBay. Selling at 6 figure levels and they still have no support for sellers, treat you like crap, obfuscate what you're actually paying in all combined fees. Mine never got below 39% including all fees combined, shipping, tax, transaction, and platform with a perfect account. For the actual work they do, they are not worth half of that. If they were not a monopoly, a competitive market would be half from all involved. Taxing used goods is criminal. Logistics is a scam of ridiculous bureaucracy, and online transaction processing is more like a skimming operation with a government piracy charter, while actual eBay is mostly automated.

Looks legit all the way down to the goat. Screams tribal dogma

My goto brain game is how many digits of long division I can do just in my head. Usually only like 7-10 cause I'm dumb.

Get into writing your own fiction stuff you're really interested in. My science fiction universe is about the first stage of interstellar colonization. I love working out the technology and what the experience might be like without any fantasy magic involved. The best part is the positivity that comes with imagining a distant future and what is actually possible. It creates perspective about where we are actually at now and how limited it truly is.

It tries but the value is floating until it actually has a full charge cycle. There is no way to know what the entire voltage range is. You're getting into how efficient the chemistry is over time and that is impossible to measure. It can be estimated, but that is all theoretical and not real. When the battery is fully discharged, the time, temperature, and current can be used to determine Coulombs and that is the actual energy capacity.

I'm not an expert, but I have built many circuits. My main experience here is in reverse engineering some gaming hardware that had an advanced battery management chip from Diode Semiconductors. That had such a Coulomb battery meter. The board was a 3 layer PCB and I took that as a challenge. The batman chip was also a small ball grid array (pins are inaccessible on the back side. I didn't have xrays when I did the first trace of all pins, so I had to fully understand the chip to trace all connections only using the vias. I think I have a chip or two in parts drawers that do the same thing, but I never built anything with them, or at least haven't yet.

Mexicans are the future Gauls. The caesarian era was the end of real Roman democracy due to disgusting consolidation of wealth. When all the money leaves the USA for New Constantinople, probably after the Israeli Reich looks like the Ottoman empire, the Mexicans will invade the worthless boot of rotting NA, some time around when the Atlanta beach party scene really gets cranking at end of the world and the capital Denver is weak.

It does not know the capacity loss of the cell over time. That is why you should let the battery go completely dead and then charge it to max capacity as this will recalibrate the coulomb meter on the battery manager - batman

Not true. I'm against both. You have a right to be a citizen in a democracy. Citizens and democracy only exist when citizens have a right to all information, the right to skepticism, and the right to be wrong. No one truly thinks for themselves without these as a foundation.

Come on, we all know you were Page of the menu and Vassal of fief Water Vessel

I'd prefer benevolent god over tech wizard bdsm billionaire exceptionalism. The guy choosing to be small is far greater than the guy buying big shoes