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A Star 32U4 Prime LV hub displays 5 V (see BSS138 datasheet hub displays 5 V (see BSS138 datasheet (92k pdf) for details) The output voltage can be set using the trimmer potentiometer in the upper right corner of the board including superior power management that enables efficient operation from 2 V to 16 V (though it requires at least 3 V at start up) The A Star Prime offers many additional features and improvements over competing products
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