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hzeller avatar hzeller commented on July 23, 2024

I don't know what causes this particular pulsing.
What is the platform you're using (Linux distribution and architecture) and the external sound card ? I guess there are many reasons things could go wrong, but this might help drilling down to it.

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LeePorte avatar LeePorte commented on July 23, 2024

It's a really odd one.

I'm using Raspbian (Ras Pi official OS) on ARM-HF. The sound card is a Cambridge Audio DAC Magic. It's a C-Media chipset feeding the Wolfson DACs directly.

I'll put the exact chipsets for you. I'll also try to get a recording of the pulsing.

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blackbicbiro avatar blackbicbiro commented on July 23, 2024

Check that its not a crappy powersupply. I had a cheap powersupply that made alot of noise. I changed it out with a PSU that had good filtering and my pulsing went. the pulsing i got was about 50hz (funny enough the same a uk main frequency)

edit: sorry i have just assumed that you where using a raspberry pi. if not ignore me completely

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