Strange trackpad noise observation

[Skeletal-dæmon]

This isn't so much a problem as something I have just noticed. Everyone in the house is asleep, and for once I don't have headphones on.

When I use two-finger scrolling on my BlackBook, there is a strange... almost purring noise from my machine. It's extremely quiet, and I can only pinpoint it to the kinda under-keyboard-towards-hinge area. It is loudest when I scroll on pages with a lot of dark/light alternation on the page, and quietest on plain light pages.

It really is quite odd. Am I making my Mac purr by scrolling through all my regular webcomics?

 

[RiCEADDiCTBOY]

This isn't so much a problem as something I have just noticed. Everyone in the house is asleep, and for once I don't have headphones on.

When I use two-finger scrolling on my BlackBook, there is a strange... almost purring noise from my machine. It's extremely quiet, and I can only pinpoint it to the kinda under-keyboard-towards-hinge area. It is loudest when I scroll on pages with a lot of dark/light alternation on the page, and quietest on plain light pages.

It really is quite odd. Am I making my Mac purr by scrolling through all my regular webcomics?

i'm going to take a wild guess and say...fan?

 

[Skeletal-dæmon]

i'm going to take a wild guess and say...fan?

Nope, SMC doesn't show any speed variation, and I don't think its a vibration at all, just this odd little 'prrrrrrrr' noise.

 

[retroneo]

It's the power supply making different sounds when there is different levels of load.

Scrolling uses a little more power and you'll sometimes hear the components vibrate and make different sounds.

There's an awesome article by and ex-intel worker who detailed it in depth. I'll see if I can find it.

 

[RiCEADDiCTBOY]

It's the power supply making different sounds when there is different levels of load.

Scrolling uses a little more power and you'll sometimes hear the components vibrate and make different sounds.

There's an awesome article by and ex-intel worker who detailed it in depth. I'll see if I can find it.

that was my next guess.

 

[NewMacbookPlz]

It's the power supply making different sounds when there is different levels of load.

Scrolling uses a little more power and you'll sometimes hear the components vibrate and make different sounds.

There's an awesome article by and ex-intel worker who detailed it in depth. I'll see if I can find it.

That's crazy!

Nothing like that on my UMB thankfully, heh...