Review on Anmbest 10 Pack AMS1117-3.3 Voltage Regulator: Efficient Step Down Power Supply Module for 4.75V-12V to 3.3V Conversion - 800mA Buck Converter by Ron Collins
No problem with 300mA
I used one with a USB power adapter to light up some DC Christmas lights that use three 4.5 volt AA batteries. At 3.3V they looked just as bright and I used them to power a 3V flickering LED candle. The USB cable had to be modified to attach this board to it and connect it to the battery compartment connect to power the candle's LED. This little board worked perfectly and delivered 2Ah/night.
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