DROK dc-dc converter board input voltage range is 3.5V~12V
thingiverse
USB Input Converter Board, DROK 2PCS Buck Boost Voltage Converter Board Requires 3 M3*20 screws for assembly. Buy on Amazon at https://www.amazon.com/DROK-Converter-Regulator-Adjustable-Transformer/dp/B07K6GRWKR/ref=sr_1_1?keywords=DROK+2PCS+Buck+Boost&qid=1561345422&s=industrial&sr=1-1-catcorr
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