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Limitations for rpi power supply?

Hi,

I use amp+ with my pi and I have a 12v 6a power supply connected to the amp+.

The pi - as written there https://www.hifiberry.com/build/documentation/connecting-power-supply-and-speakers-to-the-hifiberry-amp/ has no own power supply.

The pi still has some usb ports that can be used. Are there any limitations for additional appliances / decives connected via usb as screens, hard discs, ... that also needs electricity?

Thanks in advance

Florian

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