11-15-2019, 03:21 PM
(11-14-2019, 04:07 PM)tgrauss Wrote: If you set the brightness of the screen to the maximum, the noise disappear. This means that it is the PWM used to set the brightness of the screen which is causing this.
We will have to see if it is possible to add some shield around the components which are setting the brightness.
Good job on identifying which of the PWMs is causing this. I also confirm the whining noise disappears in brightness above 90% or below 30% (rough estimates).
So listen to music in darkness or on sunny days only ;-)
Ok, seriously I hope we can figure out how to tweak the hardware.
As a side notice: in general the audio output has quite some white noise. But I do not complain about this, it is normal for cheap devices and does not disturb me as much as the whining PWM noise. After all the whole pinebook costs the same as just the audio interface of my desktop PC.
