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Check if your IKEA chair is compatible with your screen

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Re: Check if your IKEA chair is compatible with your screen

#141

Post by JerryB77 »

treeman79 wrote: post #8
akarlsten wrote: post #2

Had the same issue a while back, had a hell of a time figuring out why one of my screens would flicker or shut off momentarily whenever my girlfriend sat down at her desk (which is next to mine). Even initially figuring out that it was the act of her sitting down that caused it took some time, with a lot of jokes about her telepathically messing with my setup in the meantime. Turns out that the gas piston in her chai…

There is a noise filter that you can clip onto the power line or other cables to help prevent radio transmissions from going into the line or other sources of noise. Maybe one of the cables is acting as an antenna. https://www.amazon.com/VSKEY-Anti-interference-Telephones-Eq...

A friend of mine bought IEMs with a microphone (Moondrop Chuu) and it would pick up radio frequencies that you could hear through a voice call. These didn't end up fixing it, I suspected it was bad grounding but we never ended up solving what the root cause was.

Re: Check if your IKEA chair is compatible with your screen

#142

Post by spyder »

paulgerhardt wrote: post #38

Previously: https://news.ycombinator.com/item?id=21978004 [13 comments] https://news.ycombinator.com/item?id=22036652 [2 comments] https://news.ycombinator.com/item?id=21976814 [1 comment] https://news.ycombinator.com/item?id=32515662 [0 comments] https://news.ycombinator.com/item?id=22014012 [0 comments] https://news.ycombinator.com/item?id=35737780 [0 comments]

And a superuser.com thread:

https://superuser.com/questions/1406140/monitor-screen-that-...

Re: Check if your IKEA chair is compatible with your screen

#144

Post by r2_pilot »

treeman79 wrote: post #8
akarlsten wrote: post #2

Had the same issue a while back, had a hell of a time figuring out why one of my screens would flicker or shut off momentarily whenever my girlfriend sat down at her desk (which is next to mine). Even initially figuring out that it was the act of her sitting down that caused it took some time, with a lot of jokes about her telepathically messing with my setup in the meantime. Turns out that the gas piston in her chai…

There is a noise filter that you can clip onto the power line or other cables to help prevent radio transmissions from going into the line or other sources of noise. Maybe one of the cables is acting as an antenna. https://www.amazon.com/VSKEY-Anti-interference-Telephones-Eq...

A similar device does not suppress the chair/monitor effect for me. Although that monitor is particularly bad (an Asus Rog, no less!).

Re: Check if your IKEA chair is compatible with your screen

#145

Post by emiliobumachar »

lucb1e wrote: post #73
chipper02 wrote: post #10

Easily solved with some ESD spray: Not affiliated with Jensen, just did some googling and found a place that sells it in single cans. https://www.jensentools.com/product/160-188-1726-QT

> Fast drying, anti-static coating eliminates static charge and reduces triboelectric generation from flexible surfaces. The page unfortunately doesn't explain what this is or how it works. Is it a conductive coating so that it can dissipate the electricity into something else, or does it form a shielding layer instead so that it won't zap stuff?

Beware of toxicity of unknown conductive sprays, especially in enclosed spaces.

Re: Check if your IKEA chair is compatible with your screen

#146

Post by mrguyorama »

blueflow wrote: post #14

I once had the problem that running make with too many parallel jobs (-j) would change my keyboard layout. The machine was some laptop mainboard glued to the backside of my monitor, and the USB socket came out at the top of the mainboard. On its way down, the USB cable for the keyboard passed across the whole mainboard. On high load, the mainboard created enough interference to cause the connection to reset, re-hotpl…

I once had to rip VHS tapes from family to digital. I had a VHS deck and a spare laptop with a little RCA plug to USB dongle to ingest content. My first few test rips were awful quality, full of analog noise and weird banding and just unexplainable signal degradation. I couldn't understand, because when I was just playing with the dongle the signal was great.

Eventually it dawned on me: I sat the laptop, right on top of the VHS deck while running the rips. The VHS head ended up directly under the CPU and HDD, such that, CPU and hard drive activity were interfering with the tape reading! I moved the laptop off the VHS deck and everything worked just fine.

Re: Check if your IKEA chair is compatible with your screen

#147

Post by mrguyorama »

mlyle wrote: post #30
yborg wrote: post #23

One of my first jobs 30+ years ago was ESD testing automotive and consumer electronics. I would spend a week with a discharge gun methodically running different discharge energies and waveforms both directly onto the devices as well as onto radiators at various distances from the device under test, as well as any cabling/harnessing that attached to the device. Then the design team would figure out the reason for any…

Cars are a terrible ESD and EMC environment and safety critical at the same time. Computer equipment usually does pretty well, especially after installation (when there's good ground path everywhere and it's in a chassis). Between ferrite beads and TVS, there's a pretty good amount of protection, and I've seen pretty few ESD anomalies-- a reset or two when touching connectors long ago is about the extent of it. RFI a…

Saitek (now logitech) sells flight simulator peripherals in the form of a throttle box and separate flight stick. They use two different USB cables and plugs instead of connecting one to the other, and they are technically two different devices. If you connect them to the same USB hub or to a USB system with not enough power, they will seem to work just fine, but will send a completely random button press or stick movement every so often. Changing ports will fix this.

Another logitech one: I have a g27 steering wheel/pedal set/shifter combo. The pedals plug into the wheel, which also connects to a power supply and USB cable to connect to the computer. If you plug the steering wheel into the power and DON'T plug in the USB cable, metal parts of the pedals "leak" current, and you can feel a painful sensation if you touch the metal with exposed skin.

Re: Check if your IKEA chair is compatible with your screen

#148

Post by edwintorok »

Had similar problem with my Steelcase chair: every time I'd stand up and my heels touched or came close to metalic part of the chair there was an electrostatic discharge that causes the screen to flicker on/off for a moment. My previous chair never had the problem.

Solved by an anti-static floor mat from Floortex. Interestingly only one of the screens reacted this way, the one connected through displayport, HDMI seems more forgiving of electrostatic interferences like this.

Re: Check if your IKEA chair is compatible with your screen

#149

Post by moron4hire »

eitland wrote: post #128
tinglymintyfrsh wrote: post #106

Earlier quoted context omitted.

My dad's car had velour interior. Anytime the humidity was below 50%, expect the car to zap you and to be zapped touching door handles. I assume there are/were numerous gas station fuel fires from cars with velour upholstery.

One stupid little thing I realized after having sometimes been consistently zapped by mybcar door and other times not getting zapped in the same weather and humidity: If I open the door and grasp for the (metal) edge of it before I start sliding out of my seat I will be grounded and consequently not build up charge as I leave the seat.

One of the worst shocks I've received in my life was not accidentally touching one of the prongs of a half-inserted 120v mains plug, but pulling one of my fleece blankets off of the other on my bed, and then getting my shoed foot within 6 inches of my metal bed frame. I almost fell over, grabbed the upper part of the frame with my hand, and received yet another painful shock.

Re: Check if your IKEA chair is compatible with your screen

#150

Post by HeyLaughingBoy »

bentcorner wrote: post #88
lucb1e wrote: post #47

An electric lighter does this to my mouse when I zap specific objects with it, such as a screwdriver. I tried distances up to about 1.5 meters away from the mouse. The only reason I initially noticed is because I saw the red light turn off that was coming faintly through the holes I drilled in the top to let a heating element that I had built in heat my hand better. (Spoiler: the holes didn't do anything, but I did n…

> It took some time for ~15-year-old me to figure out that it happened with high rates of small network packets I honestly think that there's a hidden potential with instrumenting programs with different noises, and being able to listen to them could give you a broad understanding of program behavior without needing to profile or watch logs.

I used to write code for a certain machine that ran long, complex sets of instructions. We could tell what sequence it was running by listening to the "tune" the motors played as it ran. Was also easy to tell when there was a bug or some other problem: the sound would be "off" and sure enough, a few seconds later there'd be an error message on the display.
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