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HifiDacberry + power source

Hi,
I would like to buy hifiberry dac+ for my raspberry b+ but i need important info to do so:

How much power supply I need in order to make both pi and your shield working?

Is there a jack input for this purpose?

Can I drive speaker directly from the shield ? if yes wich power can it gives to the 4ohm speaker?

Can I use other GPIO pins (for other tasks) after connecting the shield ?

Please answer me in order to uy it

thanks a lot
nico

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