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Renate · 03-12-2023, 09:20 PM

Hmm, that's not good. Does the volume control affect it at all?

The eink circuitry uses a bunch of voltage pumps to generate the higher voltages (10-15V?).
This presents a load on the power systems.
It could be that this is feeding into the audio.
Or it could be that it's all by induction/radiation of nearby circuits.

It could be unique to yours if a capacitor is missing/faulty.

There is also the problem of capacitors themselves making noise.
These multilayer caps can be a bit piezoelectric.

03-12-2023, 09:20 PM	#2
Renate Onyx-maniac Posts: 3,991 Karma: 18026955 Join Date: Feb 2012 Device: Nook NST, Glow2, 3, 4, '21, Kobo Aura2, Poke3, Poke5, Go6	Hmm, that's not good. Does the volume control affect it at all? The eink circuitry uses a bunch of voltage pumps to generate the higher voltages (10-15V?). This presents a load on the power systems. It could be that this is feeding into the audio. Or it could be that it's all by induction/radiation of nearby circuits. It could be unique to yours if a capacitor is missing/faulty. There is also the problem of capacitors themselves making noise. These multilayer caps can be a bit piezoelectric.