Help Wanted: Arduino Nano Doesn't Work With 9V Battery : r/arduino
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Small Footprint Arduino Nano With USB Charging Circuit (Li Ion or LIPO) That Can Turn Itself Off (soft Latch Power) : 8 Steps (with Pictures) - Instructables
2 X AA Battery To 6V Boost Converter For Arduino Nano - Electronics-Lab.com
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Noob question: How do I run an amplifier and an Arduino off of one 9v battery supply? : r/arduino