HN user
I’ve just read the wiki page on Magnetorquer but I couldn’t find what I was looking for: ballpark numbers.
What kind of current are you driving those coils with (amps or dozens of amps?). What order of magnitude is the resulting force (a few newtons?)
I’ll gladly read the paper but knowing myself I won’t remember why exactly when a few weeks passed.
ok you have reduced my cringe.
This is the reason I cringe every time I hear or read statements like “we went to the moon”, “we’ve split the atom”, “we developed antibiotics”, …
No, we didn’t. A few who are not like us did.
dementia, weight loss, unsteadiness, jerking movements and facial twitches
I’ve occasionally found them, but only when their color contrasts with the background during walks. Can they be found year round? Do they have a preference for logs?
I’m going to go against the standard advice of this book or that course.
Pick up (broken) equipment and start disassembling it to figure out how they turn A into B [1]. Go down the rabbit hole of hunting down the service manual of the thing or one of its siblings. Look at how the pcbs follow the same pattern in competing design. Look at how all the yamaha, sony, medion, … amplifier/tuners are made in the same way and learn from it. Notice that one that is costlier and has those few quircks in its design. Notice how different variations of a theme achieve the same result, but died out because the tech doesn’t scale or simply proved to be suboptimal. Try to repair your broken equipment by understanding the path that the signals and power lines follow.
Rinse and repeat a few years and you’ll get a grasp on what the innards of an unknown electronic thing looks like without opening it. Then open it and be amazed that there was a different, cheaper, simpler way to turn A into B.
All along the way you’ll experience that most educational resources aren’t actually that good at explaining, or that they follow a different school of mathematical notation, or that they’re really good at explaining this detail but the rest is missing.
Design your own pcbs. Remember that - like software - hardware design is iterative. Remember that - unlike software - hardware iterations cost money.
Hope this helps.
[1] the ways to turn A into B are rather limited and it relies heavily on electromagnetism and conservation of energy.
Thanks for submitting this. I’m currently working on the schematic of a VNA and having a ref design is a big help.
a process that can be used *on site* to render environmental toxins such as DDT and lindane harmless and convert them into valuable chemicals – a breakthrough for the *remediation of contaminated sites*How does this work on a practical level? Do you scrape the soil to a depth of a foot and submit it to electrolysis or is the soil washed and the sludge then processed? How many grams of halogens does this recover per square acre of contaminated site? Does this sterilise the site?
This plant gave up photosynthesis, shrank its genome, and learned to clone itself—and somehow survived for 100 million years.
Same experience here. The more commonly known the stuff it regurgitates is, the fewer errors. But if you venture into RF electronics or embedded land, beware of it turning into a master of bs.
Which makes sense for something that isn’t AI but LLM.
I opened the article expecting to read about its use in plant breeding: colchicine is renowned there for inducing polyploidy. Never knew it has a history in medicine.
I wonder what the influence of wind is on survival of flying insects. Over here - W. Eu. - we’ve seen storms on a monthly base now. I don’t think the energy balance of foraging adds up if there’s too much wind.
Where can I find the picoIDE schematics & code? All I find is picoGus.
4) the whole system is rigged and the playbook is entering a new chapter
Did anyone ever make a simulator for pennies hitting the floor like in the top video?
I’m in the process of cleaning out my “varia” parts bin. It’s a box of neat-looking chips with an id that looks easy to google for datasheets … but most are locked away as you state. There is a fixed barrier for hobbyists around the 100 to 200MHz bus rate area. From there on hardware that’s available for diy projects gets dumbed down or bottlenecked in some critical section. Every once in a full moon you get a glimpse of the product brief for a chip you desoldered from a docsys decoder and see what’s behind the NDA wall. Oh well, here’s to fpgas.
Very true. I’d like to add that it appears to be common on chinese sites to use micro-payment systems. You want the modified code / device driver / pinout / datasheet or rom dump? Please pay 3 cents.
On the Russian fora I’m often hitting a wall with unfamiliar chip IDs in their schematics. But when looking up smd markings they often have a nice photo of the part in situ.
Last year was my first participation and did everything in javascript in the browser. It’s high level enough to not lose your time in details, you have a graphical output if needed (canvas), text output, threading, parsing, …
The iot devices are hacked on the application layer. You have a controller running some linux distro and you work your way in over tty/telnet/eth. That’s an entirely different ballgame than repurposing 8-bit avr or 32-bit STM microcontrollers.
Looking at that list, collapse OS seems to cater to 8-bit only. It’s also aimes at “ built from scavenged parts” boards. I’ve often come across Hitachi h8, Blackfin, PIC, avr, the occasional ARM and other controllers in the wild. But they all have one thing in common: the flash is locked and inaccessible without some jtag tools. The only times you’ll see external flash (winbond & co) is with an fpga or a controller who’s had his otp memory configured with a bootloader.
I often re-purpose scavenged board because of their useful layout, but only after swapping the controller for a programmable one. The notion of scavenging the controllers themselves… far less practical as you think.
but as usual, the Internet Archive saved the day.
Consider donating if they helped you.
From our 1 datapoint set I’m leaning towards the “earth is an aberration” theory. This was a dinosaur planet. There was a reset some time ago that cleared the path for mammals. It’s unlikely that this timing is common.
With terrahertz rectifiers you can use antennas and diodes to convert light to DC.
“ simply because its business model for profit is broken.”
I use llms pretty much as a search engine and refreshing some programming tips. It’s over-confident for code review, doesn’t really handle arithmetic and sometimes fun as a co-writer for embedded stuff.
As an aside - isn’t it remarkable that we’ve introduced uncertainty and doubt into the knowledge processing layer? We have decentralised networks that run on Bayesian symbols for server-client models, CPUs that crunch Markov chains and now AI that hallucinates. On Deterministic Turing Machines.
It would also explain why the movie was recommended to me yesterday in netflix.
A terrahertz rectifier would be a boon for solar energy.
There’s a solution to the Fermi paradox somewhere in this string of comments.
You’re correct. Iirc the blueish smoke from car tires share a similar property.