j4k3

joined 2 years ago
[–] j4k3@lemmy.world 1 points 17 minutes ago

Could, but then I lose portability like with mounting it in my laptop stand.

Everyone here seems to want to solve everything but the actual abstraction of wanting to know a way to calculate a thin liner material to add to the portable box that is not reliant solely on empirical brute force.

If someone else asked, I'd be saying the same things. It is easy to assume people can replace such knowledge with empirical testing and observations, but when the physical efforts become harder, working smarter has value to me.

[–] j4k3@lemmy.world 2 points 37 minutes ago (2 children)

Pain is due to neck and back. So the root of the problem is the weight of my head, and why I'm stuck in bed in the first place. I have some noise canceling headphones already, but between the weight and positional constraints they cause they are an issue. It isn't a real problem because I usually do not leave the thing on or plugged in. I have been doing so lately because I have needed to test a lot of AI models with Emacs looking for the most capable, with thinking and function calling, and the largest available context, along with others that can be switched in an agentic system and are more capable and potentially specialized with my own fine tuning.

I should just get another larger NVME drive, but purchasing anything right now sounds stupid.

[–] j4k3@lemmy.world 1 points 45 minutes ago

But is there a direct rule of thumb (or more) about the relationship between density, thickness, and frequency?

[–] j4k3@lemmy.world 2 points 53 minutes ago (4 children)

If I play a sound from a driver on my left, and the noise is from a device on my right. I believe they will not cancel out and I will hear two noises on each side of my head. My head will act like a shadow to the wave front as it propagates right? I suppose one could build a device to play the sound at the drive, but that is a bulky solution.

I was asking about passive damping here, not that I mind the tangent.

[–] j4k3@lemmy.world 2 points 1 hour ago (10 children)

I don't think so. The thing is on my laptop bed stand. So it is always in arm's reach and I don't have a controlled environment because I move around within the room. I was thinking more like some kind of specific sound damping material to line the interior of the box for the external HD but the thing is small.

Two things here, the cover could be lined with something thin. Or I could shove it inside the box I made originally for my laptop PSU brick but had to mount the latest one underneath (mess of a cord visible on the other side of the HD). I'd need to do the new PSU plug differently to get the HD all the way into that box. Still all I can do is brute force an empirical damping solution. I can't even ballpark about material properties and sound in this space. It would be a handy abstract skill.

 

I have a small hard drive that is making a constant high pitched sound that is typical of the drive, and not very noticeable to the average person, but I have pain induced noise sensitivity. I am curious about how to calculate damping potential. As an initial guestimate, the frequency is very near to my maximum audible range and likely around 12kHz-16kHz. It is a little higher than the switch mode power supplies that I can also hear if it is dead silent in the room, although the drive is a higher amplitude. Addressing the noise with a solution is probably beyond the scope of anything I would actually do, but knowing how to solve it is far more interesting to me. (ELI15 )

[–] j4k3@lemmy.world 3 points 3 hours ago

Indirectly too I think. I use wiki much more often as my default search location now. Search engines are garbage and often override or ignore booleans. The results that are garbage are shilled.

[–] j4k3@lemmy.world 4 points 1 day ago

So with my body shop, I rarely ever had the time and motivation for my project car. When work dried up, I put all of my efforts into trying to sell my services to new used car lots, but the entire market crashed in 2008.

I got down to my last savings and faced having to move back in with family. I decided to use up some of my last supplies and spend a couple of weeks getting my little project car in good shape before planning to drive it home. IIRC it was around February. One of the things I had was a large aluminum radiator that was much bigger than the original. I thought I had fully drained the block, but I had been making custom tubes and welding up all of the radiator support structure and ducting. So I had used water many times just to leak test the thing.

I also had just done aluminum heads, long tube headers, intake, and modified the engine mounts to set the motor back a few inches. There were a lot of potential issues to sort out.

When I got it running, it blew white smoke when it got warm. It wasn't terrible at first, but it was a major disappointment. Still I pushed through and put off the issue while finishing the paint work. Based on compression tests it looked like a bad head gasket and that is only a few hours of work for me to fix.

The whole car was still in primer and I was changing colors, so it was a huge job to prep, jam, and paint it. Plus, while I was sick of the chemicals all the time, my project car is basically my business card if I ever want to get a job in a shop as a painter for someone else. So that job is important to get perfect.

It came down to the last few days before I had to leave, I pulled the head, and apparently some water had been in the block still at some point from doing the radiator. It froze but didn't blow the freeze plugs like it should have done and instead cracked the block. I was out of money and options at that point so I wound up driving it to a friend's house and putting it in his backyard for a year until I could fix it All of that happened in Atlanta. My folks live in California.

I got a Pontiac Fiero for $400 because a person did not understand the suspension problem it was having but I did. I fixed it, got a job in a machine shop, and eventually a job porting heads for nostalgia dragsters. That let me build an engine over a few months. I replaced the Fiero passenger seat with the engine and drove that back to Atlanta. Tossed in the motor in the camaro, while sleeping a the snake infested shed, and without a cherry picker. Then I sold the Fiero and sorted out the camaro on the road. There were a bunch of problems that happened on the journey, but that is not unusual for so many new and custom things mixed together.

The sad thing is that when I was disabled on a bicycle ride to work in 2014, I had that motor apart again and was adding new pistons, rods, better heads, and a B&M mini blower to the thing. I had the heads off, and there was nothing I could do to seal it up. I never got in shape to fix it, and had to nearly give it away when I was forced by my folks. That was as devastating to me as the injury itself. That car was a part of me and my identity at that point. It was my battle scar from the hell of the times and struggle I had to overcome.

[–] j4k3@lemmy.world 6 points 1 day ago (4 children)

Rode a bike to see how far I could go. My longest day was around the Santa Ana mountains between Orange, Los Angeles, Riverside, and San Diego Counties. I've ridden all the way around those mountains. My computer went dead at 176 miles but the trip was around 220.

I moved 2k miles across the country one time because of my highschool sweetheart, just to give it a chance. She was not acceptable to my folks for stupid cultist religion reasons.

Not really in the not allowed section, but I had this hotrod camaro that was my little project. I had to move back across country and leave it with a friend. It needed a motor. I worked for a machine shop, built a motor, got a cheap car, tossed the motor in the passenger seat and drove 2k miles. Put the new motor in and sorted out all the kinks on the 2k mile drive back home. I definitely couldn't do something like that as a kid

[–] j4k3@lemmy.world 6 points 1 day ago

I have existed totally ad free for a few years now. I use a whitelist DNS filter.

[–] j4k3@lemmy.world 5 points 1 day ago

False premise. I default to doing anything within my power for any stranger I can. I only prejudice against those that give me reason. To me, that is part of being an honest person. I can't fix everyone else, but I can fix me. I will probably die homeless on the street on a cold rainy night eventually. But you know what, when the stranger was out in front of my house last week with a broken chain on his bicycle. I fixed it on the spot. Likewise if I see you having trouble beside the bike trail with a flat or issue, I'll stop and help. When my neighbor's water main broke, I was the first person at the street with a wrench to shut off the water even when it couldn't affect me. If I see a homeless person that is hungry I try my best to get them something to eat or a few dollars to help. When I made really good money a long time ago, I gave a random homeless person a hundred bucks around once a month. I haven't made a significant dent in the world. It makes me feel a little better to do everything I can when opportunity presents itself. Anything less is foolishness IMO. You are only ever one bad day away from being in the exact same position as the most destitute and unfortunate person you encounter no matter how good your life appears. The magnitude of events varies but there is such a scenario for everyone alive even if they are too dumb to see how such a thing is possible.

[–] j4k3@lemmy.world 4 points 1 day ago

There is a lot of potential for generating on the fly skins and specs. Everyone seems to want to do stupid flashy junk, but a well configured agentic setup could easily get constrained in ways that alter geometry and interactions more dynamically than the broad scope nonsense I keep seeing.

[–] j4k3@lemmy.world 1 points 1 day ago

Trump looks strange without hair over the forehead, monochrome, and with a beard right? Image below in another reply. Terrorist is a terrorist. I was too lazy to change the rest, but I took out the main offensive stuff, like what bin Laden was wanted for in this original poster from '99. There is nothing bigoted about it whatsoever; quite the opposite really, to the point I gotta ask what you're going on about here? The man just hurt millions of families, and the poorest Americans likely leading to the deaths of tens of thousands in a conservative estimate. Bin Laden killed FAR FAR fewer Americans and others abroad.

 

Is it super standardised, like where all 30 or 40 pin LVDS connections are the same, as in pin and voltage compatible?

Are there hardware peripherals in a microcontroller that just drive LVDS like how UART, SPI, CAN, etc. work? Or is it a messy complicated thing with display specific power supply voltages, and unique power management requirements, baud rates and such?

I can find lots of old style monitor to HDMI or VGA conversions for an old laptop screen based on display model number. But what I am looking for is a USB-C/USB-3 to LVDS converter board small enough to fit into an old apple laptop top shell and act as a second monitor with all power and functionality controlled through the USB interface. I have the fab skills. If there is a simple chip that does USB-C PD/display to LVDS, I'll toss it in KiCAD and etch it myself if I can get the chip. In my past experience with small displays for hobby microcontrollers, they were anything but standard in most cases. I have never messed with the larger stuff though. It appears like most of the old style VGA/HDMI converter boards are mostly sold with the same hardware/board with the proper LVDS connector installed.

I can take care of the backlight driver part. I'm mostly concerned with what is going on with LVDS in practice. Anyone familiar with the subject on Lemmy?

 
 
 
 

cross-posted from: https://programming.dev/post/26664400

Tarlogic developed a new C-based USB Bluetooth driver that is hardware-independent and cross-platform, allowing direct access to the hardware without relying on OS-specific APIs.

Armed with this new tool, which enables raw access to Bluetooth traffic, Tarlogic discovered hidden vendor-specific commands (Opcode 0x3F) in the ESP32 Bluetooth firmware that allow low-level control over Bluetooth functions.

In total, they found 29 undocumented commands, collectively characterized as a "backdoor," that could be used for memory manipulation (read/write RAM and Flash), MAC address spoofing (device impersonation), and LMP/LLCP packet injection.

Espressif has not publicly documented these commands, so either they weren't meant to be accessible, or they were left in by mistake. The issue is now tracked under CVE-2025-27840.

 

Dude was obviously baited into a staged situation. Words are worthless anyways. People that focus on words are imbeciles. Actions are what matter. Words are as hollow and meaningless as intentions.

These propaganda posts need to go. Nothing about this is news or relevant. It is Goebbels' Garbage.

 

Calling best backronym experts. Give it your best shot.

 

I am trying to understand the limitations and weaknesses of a system of complex human social hierarchical display based on reputation and accolades instead of the accumulation of wealth. Academia is one such example of a hierarchy based on reputation.

What are the weaknesses of such a system, such as failures to account for human adaptation and growth? Where are factors that are not in line with meritorious achievement and the scientific process? What changes could be made to improve the social system of a reputation based hierarchy?

This post is heavily abstract and conceptually framed in layperson terms. Feel free to rephrase and infer meaning. I am thinking about a distant science fiction future when accrued wealth is no longer an adequate form of human hierarchical display, and the benefits, frustrations, and failures of such a system.

 

Most people know that a microwave works by exciting water molecules, but I'm not interested in the dangers of the high voltage/current of a magnetron. I wonder what might be possible with scrap consumer drivers such as a piezo, speaker drivers, or ultrasonic inducers, preferably at a frequency outside of the core human audible spectrum.

  1. Would an induced vibration in an around 60°C, lightly convective environment, likely significantly increase the evaporation rate of water moisture absorbed within the filament of a spool of consumer grade 3d printing filament such as PLA, PETG, PC, TPU, or Aramid?
  2. Would certain frequencies likely alter performance?
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