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DAC+ separate power supply

If i want to power the DAC+ (not Pro) Board seperatly from the RPi 3, i think i hat to use the P3 Connector points ( +/- 5V) and cut the connection line where (on the Pro Board) the R14 Resistor sits.

Is this correct ?

Is there a Voltage regulator on the DAC+ (not Pro) Board ?

What is the Voltage Range that i can use.

Best Regards, Helmut Rosenberger

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