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polarity inversion and can handle a small amount of overvoltage for a limited amount of time.
If USB and jack connector are connected at same time V-Uno will get power from DC jack and
draw almost all the current from jack PSU.
Electrical Specs
Input impedance: 1M ohm
Output impedance: 600 ohm
Max input voltage IN: 1.17V RMS
Current drawing: 130mA
Max jack DC input voltage: 9V DC
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