[JohnSchmidt]

I use the 3.5mm jack of my laptops when I use them but when the battery is low, I have to connect the charger and that is when a faint electric buzz comes in.

I use fairly sensitive IEMs such as the CA Andromeda and Audeze headphones. The buzz can still be heard even when I use usb c DACs such as the Q5k or BRT7

What is the solution?

 

[Doug2507]

Just had this with a colleague using a macbook, he would get buzzing whilst charging unless he put a finger on the chassis. Gave him a shot of my S2 with shielded USB cable from my iFi Gryphon, instantly got rid of hum / buzzing when his charger was plugged in.

 

[dunring]

Did you try other USB ports to see if any further away from the power supply are quiet? I've had a Soundblaster X1 and the filter on that really silenced the noise floor on some USB ports off my monitor hub that had a low volume hiss on some DAC's. The noise filter they use in that really works to clean it up. It sounds great, but I like them since it works natively in Android and even Linux Mint found it right away.

 

[JohnSchmidt]

I did try many things including usb ports but I just got recommended some impedance adapters and I bought one. Let's see how it does

 

[Leonarfd]

Best is probably to get a cheap DAC/AMP together with a iSilencer.

Had ground loop problems with wife's computer, bought a ifi Idefender that fixed it.
https://ifi-audio.com/products/idefender3-0/

Also helped my brother with buzzing sound in his stereo setup with
https://ifi-audio.com/products/isilencer3-0/

Probably other brands who do the same, just got them from Ifi since a local store had them.

 

[redrol]

get a usb to optical spdif, run that into whatever, done

 

[comrade1990]

If you want to continue using the headphone out you can use an audio transformer. I know radial makes some of these kinds of things. Probably better to get a DAC with isolated output though.