ChaoticNeutralCzech
@ChaoticNeutralCzech@feddit.org
- Comment on A customized delivery experience 1 day ago:
encourage to wait
How much do you pay them to compensate for the wait when they’re not delivering other items?
- Comment on Golden shovel, only for 39.99 plus shipping 5 days ago:
Sorry, shovels are sold out and production capacity all booked until mid-2028! If you want to remove the pile of toxic mining waste our biggest shovel customers made in your backyard, better book a shovel you’ll maybe receive in 2 years! Also, there is the secondary market, looks like you can just about afford a rusty spoon!
- Comment on Why put data centers in space? 6 days ago:
Meanwhile China is putting them underwater for passive cooling.
- Comment on how can text from an image not show up in a thumbnail? 6 days ago:
Such files with the .jpg extension are known as Progressive JPEG (progressively higher resolution copies of the image). Not to be confused with progressive scan video, as opposed to interlaced like NTSC. In turn, that should not be confused with Adam7 interlaced PNGs (which, ironically, accomplish the same goal as Progressive JPEG).
- Comment on how to cut aluminum pipe with hardly any comments about flock cameras 1 week ago:
FYI, if you’re a Flock employee: You’ll need a bigger one for the 2⅞ poles on your job
- Comment on When they didn't read the manual 1 week ago:
Good computer mice are rat-sized and feel like a toy car when gripped. Not a puck.
- Comment on When they didn't read the manual 1 week ago:
Yes, scrolling moves the content. As if it’s being gripped by the bottom of the wheel I’m rotating with my finger from the top.
Imagine a toy monster truck on a sheet of paper. Push the wheels forward, page moves backward.
- Comment on Are you too young to remember these? 1 week ago:
Tjat (RCA component) was fucking stupid.
Why 3 connectors when no consumer ever mixes color channels? (mixing between sources requires external sync, which is only on pro gear and an extra cable anyway)
Why did they not decide between YPbPr and RGB before writing the standard?Should have just adopted SCART (European connector for bidirectional A/V, RGBA and kind of CEC), dammit
- Comment on Are you too young to remember these? 1 week ago:
Yes, SCART’s features are fucking clever but it got unwieldy thick because by the spec, each cable had to be separately shielded. Even the widescreen control signal that’s mostly DC. Why not and use differential pairs to reduce thickness and cost, or modulate the audio and control signals together, add a 5V rail to accomodate little demodulating converters if you want separate audio devices, and eventually power PVR/tuner dongles? Most people use TV speakers anyway, that’s the whole point of a single connector of an A/V standard. Not to mention how easily it fell out, almost every other connector holds better, and the ports are hard to feel and align on the back of the TV. If it’s a giant 32" one nearly flush against a wall, good luck connecting the VCR! I think it’s because of these problems, the biggest one emerged: SCART never became a worldwide standard. Nowadays, TVs are made for a world market, so even North America finally enjoys PAL-compatible sets (while most Europe-market ones and many VCRs were 3-standard since 1990), but unfortunately SCART is basically gone, not to mention very few capture cards were made with real RGB input because RCA component is stupid (why 3 connectors when no consumer ever mixes color channels? (mixing requires external sync, which is only on pro equipment and an extra cable anyway) why not decide between YPbPr and RGB before writing the standard?)
clever Frenchies
Don’t say that. SCART is awesome despite its flaws but the exacth also cursed half of Europe with fucking SECAM. Imagine needing a 64µs, 5MHz-bandwidth delay line just to decode color at all (unlike NTSC/PAL’s QAM, SECAM’s FM allows just a single chroma channel per line, alternatingly carrying U and V axes), and a frequency-modulation+pre-emphasis system in every console/camera/DVD player to encode it, plus no color killer option (disabling the colorburst) for sharp B/W like on the Apple II!
In PAL, information between subsequent lines was used too but only to correct recovered carrier phase between colorbursts, which was optional (cheaper sets kept NTSC-style hue controls) and could be handled by a locked oscillator rather than a whole-ass delay line (before shift registers (digital sequential-access-memory), every color set had fucking piezo transducers and physical waves travelling through precisely cut quartz, WTF?!).
- Comment on [deleted] 1 week ago:
Not me, I just theorized. I met people from C3PB (@thefeiter@chaos.social) with their giant Parklight24 display and wondered what it could be used for. Also, @mat3@chaos.social had a Geascript display ar 39c3, small but with proportional font.
- Comment on [deleted] 1 week ago:
The anode current for such a small screen area is pretty low. The flyback also provides a few hundred V to 1 kV for various grids like focus and brightness of the electron gun. Since they all use voltages adjustable in different ranges, a single series of resistors and potentiometers is employed as an adjustable potential divider, consuming usually less than 1 mA (1 W).
- Comment on [deleted] 1 week ago:
I’ve been to 39C3 and EH23. Here’s a photo of my badge, advertising something I shadily imported to Germany :)
witter.cz/@sebi@23.social/116374451432382202
There is a 12V-negotiating USB-C module (I had to mod it to support any of my powerbanks, and the only one is the size of the thing, twice as heavy and a fire risk (puffed-up 20Ah cell shoddily replaced with found 6x 18650), but on EH23 I was smart enough to get a long-enough cable to reach a pocket so my neck didn’t hurt.
The screwdriver, from a shitty Merkur-like construction toy set, is plus-shaped but not as sharp as Phillips and non-magnetic, making it easy to adjust the potentiometers (a Phillips would wear them out, and a flat one would be less convenient) without the display getting all wonky (even the magnetic field inside Hamburg S-Bahn trains from their power lines makes it wobble!)
The 3 kV is presumably only reachable via the thickly insulated wire between the flyback transformer and anode, however some high voltage does exist on the PCB between the CRT grids (for example, there’s about 48 volts between the brightness and contrast potentiometers). I used a piece of acrylic to cover the bare PCB but it fell off (shitty transparent tape) and I got shocked through my T-shirt. A little unpleasant but the current is low, especially after the small HV capacitor discharges, it felt like a normal static electricity fluffy clothing incident. I prepared the same piece of acrylic with holes for potentiometers for the front but it was matte, fell off even sooner, made it hard to adjust, and it was unlikely someone would reach inside so I abandoned it.
- Comment on [deleted] 1 week ago:
Yup. The metal anode is phosphor-coated. What’s more interesting: it’s using a standard “defection IC” to detect sync pulses and generate horizontal and vertical ramps but the focus and horizontal width change dynamically as the picture is scanned top-to-bottom to achieve keystone correction and maintain sharpness.
- Comment on [deleted] 1 week ago:
The power draw is 4 watts, not much more than a color LCD of this size and brightness, and most of it is the CRT heater. Very little ionizing radiation at 3 kV.
- Comment on [deleted] 1 week ago:
I use the screen module from one of these as a nametag at cons. It accepts regular composite video and can go up to 120 Hz, or presumably even more if I tweak some component values. Jan Šlehofer used a color wheel to make a Col’R’Tel and dared to call it “solid state” in his YouTube video (the nearest Czech word is tranzistorový, which means no vacuum tubes as switching devices and he does fill this criterion but “solid state” additionally means no moving parts (that would require a super rare liquid crystal color shutter - LCCS - even Daniel Kobrle aka Danyk/DiodeGoneWild was unable to source a replacement one for his luxury early digital Tektronix oscilloscope) and arguably no CRT, although even 1960s TV sets were marketed as “solid state”).
- Comment on How I, a bike rider, look when my coworkers complain about gas prices 1 week ago:
Petrol station technology limitations were why UK partially switched to liters in the early 80s: most pumps could only show/calculate up to £1.99 per volume unit.
- Comment on Please help to test my first game 1 week ago:
Use integer scaling when rendering limited-palette pixel art, especially as GIF.
- Comment on Boys will be boys 1 week ago:
It’s called whole foods
- Comment on modern classic 2 weeks ago:
It’s a 90s TV. It probably has S-Video so worth keeping. (Reminder that almost all European TVs from 1990-2010 have SCART, which is unwieldy thick but SD RGBA, and are PAL- and NTSC-compatible)
- Comment on Tried to login to the arch wiki but was given a 3 minute crypto challenge. 2 weeks ago:
My country’s public TV stopped offering subtitle downloads for shows that can’t be streamed online
- Comment on Black emoji world record 2 weeks ago:
Keyboard shortcuts (End key I suppose)
- Comment on Cool Japan 🌸 2 weeks ago:
In my country, almost any group travelling together is going to speak on a long-haul bus or train, many of them most of the time. And lots of people make phone calls. There have to be designated quiet coaches (or open rail cars since coaches are falling out of fashion).
- Comment on Space Cats 2 weeks ago:
This is true about cats’ radiation but we usually mean reflectivity when describing a cat’s color. This of course means there is a light source illuminating the cat and the wavelengths observed also depend on the properties of the light source.
- Comment on Space Cats 2 weeks ago:
Depends on their response to wavelengths at rest, including IR (for blueshift) and UV (for redshift)
- Comment on take their money and arrest those responsible 2 weeks ago:
So I looked it up and the mass change is actually positive, about 1 part per billion per year. Not evaporation but adsorption.
- Comment on the Pope uses his teeth to eat food 2 weeks ago:
Here’s a fan edit
Image - Comment on take their money and arrest those responsible 2 weeks ago:
Duh. Do you think they’d change the value significantly?
- Comment on take their money and arrest those responsible 2 weeks ago:
The pound has been defined as 0.453 592 37 kg since 1959, having relied on the slightly evaporating Parisian etalon for 60 years. You have no moral high ground.
- Comment on [deleted] 2 weeks ago:
Hence the low rate of vaginismus education. Poor OP…
- Comment on take their money and arrest those responsible 2 weeks ago:
The kilogram is no longer defined as a fraction of the mass of the Paris etalon. Now it’s defined so that Planck constant ℎ = 6.62607015 × 10⁻³⁴ kg m²/s, where 1 s is 9 192 631 770 oscillations of ¹³³Cs and 1 m is how long light travels in 1/299 792 458 s in vacuum.
