6 ms·
Ferrite Bead
- woleium 3y agoI've been wondering if one of these would solve folks Ikea chair problems (where the piston causes emf sufficient to make some monitors loose signal)
- shrimp_emoji 3y agoHaha, my (I think damaged) MSI monitor gets that when I shift in my chair sometimes!
- n2d4 3y agoFor those who missed the discussion: https://news.ycombinator.com/item?id=35742476 https://news.ycombinator.com/item?id=35742476
- aaronax 3y agoThese seem to have become much less common. I'm guessing better filtering in devices themselves and possibly better cable construction?
- jareklupinski 3y agoFrom https://www.ti.com/sc/docs/apps/msp/intrface/usb/emitest.pdf https://www.ti.com/sc/docs/apps/msp/intrface/usb/emitest.pdf : > If a single ferrite bead is used it is not usually necessary to also have the separate beads as shown in Figure 8 Yup, it's probably cheaper to put a few small ferrite beads on the board than to put a big one on the cable. Being a differential signal, I never understood why USB cables would _need_ them, but seeing it on a premium cable inspires the feeling that you bought a better product? I also think reduced 900MHz interference from cordless phones (remember those?) made homes quiet enough that the bead became more of a value-add for most applications. Just guessing...
- mobb_solo 3y agoCan anyone explain the noticable symptoms of interference or radiating, in situations where usb is not filtered?
- jareklupinski 3y agoAnecdotal, but back when I was playing with spark gaps, my housemate's USB game controller would disconnect from the host every time I shot a spark. It would refuse to reconnect until they unplugged and replugged the cable back in. They switched to a better cable (with a bead), and it stopped happening.
- sebazzz 3y agoI have something weird with my Edifier speakers. Maybe a ferrite bead can resolve my issues. I have my setup as follows: Lenovo P1 --[hdmi]--> Samsung monitor ---[3.5mm]----> Edifier speakers Desktop computer with Creative Soundcard --> [3.5mm] --> Edifier speakers --[displayport]---> Samsung monitor I don't have any noise or scratching when I work on my Lenovo. I don't have any noise or scratching when I work on my desktop without having the connection from Samsung monitor to speakers connected. However, when I have everything connected I get a slight noise and scratching sound which gets more pronounced when I start to load my GPU more, for instance when running a game. At first I thought this was a ground loop, but the noise isn't constant, and isn't directly coming from my computer or sound card but indirectly via the Samsung monitor when I start to game and my computer draws more power.
- jareklupinski 3y agoInteresting, I have a similar issue when I work with CAD models. If I rotate a particular model in a certain way, I can almost hear a 'scratching' noise coming from my GPU as the frames draw. If the GPU is already loaded, it seems like the noise escapes to my powered sound monitors? I think it is some sort of 01010101 color rowhammering the memory at 144Hz...
- mistyvales 3y agoCoil whine?
- sebazzz 3y agoCan't be, as the noise isn't coming from my computer.
- mistyvales 3y agoOops, just removed one of these from an old Logitech mouse because it made it hard to plug into my 1040ST..