Question: Can the 5V to 9V DC step up converter must it only be used with a pure 5v?
Answer: Yes, the cable of 5v to 9v input voltage must be 5V(4.5v-5.5v), the output voltage must be 9V(8.5v-9.5v). At the same time, please don't ingnore the max current is 2A.
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