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I only have the Allo Boss DAC v1.2 and the Raspberry Pi model 3B+ connected to the power supply.
I will investigate the issue – also powering the devices individually – a little more and report back.
What puzzles me is that it is only the Raspberry Pi model 3B+ that makes „Under-voltage trouble“; I have now tried 3 boards with the same result.
I have now also tested 2 Raspberry Pi model 3B without any issues – only good sound – and much lower power consumption.
That is why I was wondering about the power regulation/filer on the Allo Boss board with a big voltage drop (more than 0.5V) from Allo Boss power input to the GPIO.