SparkFun will be closed Monday 7/4 for the holiday. All orders placed after 2pm MT on Friday 7/1 will be shipped out next week.


Member Since: February 1, 2012

Country: United States

  • Any idea what “U4” 3.3V linear supply, 150mA in the schematic is? I am interested in the low battery behavior and LiPo undervoltage protection. Thanks

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