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Providing external power supply to nrf52832

Hello,

I'm developing a home automation related product using mesh. For testing mesh functionality I'm placing the DK in different rooms and testing the range. As a power supply I'm connecting a USB power bank that has 5V out. When I connect the power bank to the board, the LD5 blinks fast. What might be the reason for it? Does powering the DK using power bank damage the board?

Regards,

Sunil

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