Thread: PW small noise?
View Single Post
Old 11-27-2012, 07:29 AM   #6
geekmaster
Carpe diem, c'est la vie.
geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.geekmaster ought to be getting tired of karma fortunes by now.
 
geekmaster's Avatar
 
Posts: 6,433
Karma: 10773670
Join Date: Nov 2011
Location: Multiverse 6627A
Device: K1 to PW3
Quote:
Originally Posted by Snorkledorf View Post
You can hear that tiny little hiss in a lot of electronics if you listen closely. I seem to remember first hearing it in an old Palm III or Genio or something, so it's not exclusively an e-ink thing.

You don't even have to use the browser, as long as you can get it to use its CPU. You can hear it from a Kindle Keyboard too if you turn it on and listen to the lower center area of the back panel. The Paperwhite is loudest near the upper center. I can't hear anything from my iPhone but maybe all the aluminum is blocking the sound...
Some capacitors can also make sound. Their job is to filter out transistor switching spikes in the power supply lines, but in the process they can make some noise. Again, the typical solution is to put some epoxy or silicone rubber on them. The noise is typically more of a problem in higher voltage circuits though, such as the eink displays, or fluorescent backlights in older LCD panels. Also, in 3G kindles, the periodic 3G "handshake" can often be heard loudly in nearby speakers (even with the volume turned all the way down), or in a nearby radio (even if several feet away).
geekmaster is offline   Reply With Quote