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Hijacking the RPi jack

Hi,

I'm considering connecting my hifiberry to the existing 3.5mm jack of the RPi main board. I would accomplish this by removing the DC blockers (C34 and C48) from the rpi board and connecting the hifiberry L/R signals to these points.

My question: are the analog grounds the same on the hifiberry and the rpi audio outputs? The analog ground can not be easily disconnected from the jack.

Cheers
David

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