4 ms·

> They are looking for tiny vibrations that are produced by capacitors on electronic circuit boards as current passes through them. These can make the component

> They are looking for tiny vibrations that are produced by capacitors on electronic circuit boards as current passes through them. These can make the components on the board produce annoying hums that can be off-putting for consumers. I'm so glad to hear Microsoft is taking that serious. Do you still remember the humming capacitors of the very first MacBook? Awful. Or the ones we still get nowadays in USB power supplies and other cheap gadgets?

sohkamyung 9y ago
I've heard such noises before on my PalmPilot Professional. In a quiet room, I can hear a distinct hissing sound when I turned it on. Capacitors can also play music apparently. During audio testing of a speaker system in my company, I could distinctly hear music coming from a speaker board with no speakers attached. It turns out I was hearing the audio generated by the capacitors on the board.
dvtv75 9y ago
I've got an ASUS board P8Z68 Deluxe that sings like you wouldn't believe. Drives me nuts, I just wish I could silence - but I suspect that would require new caps...
- jacobush 9y ago
  Or just pour generously with hot glue on top of suspected caps.
chli 9y ago
I think the coils are making the noise not the capacitors: https://en.wikipedia.org/wiki/Coil_noise https://en.wikipedia.org/wiki/Coil_noise
- microcolonel 9y ago
  It's often both. Capacitors also have a capacity (hah!) for making noise. Coils generally get it first since they are a more straightforward electromagnetic device.
- extrapickles 9y ago
  Ceramic capacitors still make noise (and can pickup noise) thanks to the piezoelectric effect. Coils typically make more noise though.
- dom0 9y ago
  Almost everything starts to make noises at higher currents (e.g. CPU voltage regulator). You have of course coils making noise, you have ceramic capacitors making noise to due piezoelectricity, even good old fashioned electrolyte caps can make noises and transistors buzz due to thermal expansion of the die under switching stress. Not in computers, but even batteries, cables and bus bars make noises under pulse current loads, as do film capacitors (used in high power snubbers). In the case of capacitors it also goes the other way; tapping a capacitor induces voltage spikes which can disturb analogue signals.
  - seanp2k2 9y ago
    ( the last part is an actual reason to isolate amplifiers from speaker systems. Not usually worth it aside from the very high-end. Not as much effect as isolating a turntable for sure, but theoretically it should make a difference. )
Already__Taken 9y ago
My combination of gigabyte f2a78m-ds2 and AMD A8-7600 has a hum that I can listen to how hard the gpu is working as I scroll through a web page. Thankfully our MSI boards do not make a noise.
- msandford 9y ago
  I've got a sony laptop that I can hear scrolling through the audio; it's kind of a bummer to hear these buzzes and digital groans.

sohkamyung 9y ago

I've heard such noises before on my PalmPilot Professional. In a quiet room, I can hear a distinct hissing sound when I turned it on. Capacitors can also play music apparently. During audio testing of a speaker system in my company, I could distinctly hear music coming from a speaker board with no speakers attached. It turns out I was hearing the audio generated by the capacitors on the board.

dvtv75 9y ago

I've got an ASUS board P8Z68 Deluxe that sings like you wouldn't believe. Drives me nuts, I just wish I could silence - but I suspect that would require new caps...

jacobush 9y ago
Or just pour generously with hot glue on top of suspected caps.

chli 9y ago

I think the coils are making the noise not the capacitors: https://en.wikipedia.org/wiki/Coil_noise https://en.wikipedia.org/wiki/Coil_noise

microcolonel 9y ago
It's often both. Capacitors also have a capacity (hah!) for making noise. Coils generally get it first since they are a more straightforward electromagnetic device.
extrapickles 9y ago
Ceramic capacitors still make noise (and can pickup noise) thanks to the piezoelectric effect. Coils typically make more noise though.
dom0 9y ago
Almost everything starts to make noises at higher currents (e.g. CPU voltage regulator). You have of course coils making noise, you have ceramic capacitors making noise to due piezoelectricity, even good old fashioned electrolyte caps can make noises and transistors buzz due to thermal expansion of the die under switching stress. Not in computers, but even batteries, cables and bus bars make noises under pulse current loads, as do film capacitors (used in high power snubbers). In the case of capacitors it also goes the other way; tapping a capacitor induces voltage spikes which can disturb analogue signals.
- seanp2k2 9y ago
  ( the last part is an actual reason to isolate amplifiers from speaker systems. Not usually worth it aside from the very high-end. Not as much effect as isolating a turntable for sure, but theoretically it should make a difference. )

Already__Taken 9y ago

My combination of gigabyte f2a78m-ds2 and AMD A8-7600 has a hum that I can listen to how hard the gpu is working as I scroll through a web page. Thankfully our MSI boards do not make a noise.

msandford 9y ago
I've got a sony laptop that I can hear scrolling through the audio; it's kind of a bummer to hear these buzzes and digital groans.