I made a circuit that gets power from an external 12v power supply. Since the nrf works off of 3v3 i put a 3v3 voltage regulator (lm1117) and i feed the nrf its output. The + side of the 12v rail goes directly to the arduino. I usually have the 12v power off and have the usb power the arduino while …

External power supply burning an nrf24

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