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Replying to @RangenMichael and @adafruit

Yea the LED in my circuit is just a proxy for whatever you want do do with VHI; I feed it into a 3.3V regulator, and power the battery charging circuit (if any) direct from 5V. Adafruit’s Feather M4 schematic demonstrates it well: https://cdn-learn.adafruit.com/assets/assets/000/057/242/original/arduino_compatibles_schem.png?1531010817

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