You can use a 6V to 20V unregulated external power supply, but the recommended range for the Nano is between seven and 12 volts only. To be safe and prevent any damage to your board or components ...

You can use this solution as a Power Supply Unit controller for Raspberry Pi, Terasic DEx boards or any other SoC projects requiring external power. Initially this project was developed as a part of ...

Both the Arduino Nano and Uno can be powered via their integrated USB connectors. ... However, for optimal performance, it's best to use an external power supply with a voltage between 7 to 12V.