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Car power for DAC+pro

Hi, I've built a linear regulator module to power the analogue section separately from the pi3b for use in my car. I was wondering if using separate linear supplies for the pi and DAC gives better results as compared to powering the DAC and pi together (through the pi's micro usb port) with a 5 amp capable linear regulator, or if I should power the pi and DAC with their own linear supplies. Or perhaps a buck converter for the pi and linear for the DAC.

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