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1

As mentioned in a comment, here is an interesting video giving details about the internals of a step up converter: https://www.youtube.com/watch?v=vmNpsofY4-U


2

Read the specifications in the datasheet. If the booster came without a datasheet, then you're on your own, and you'll have to measure it. One of the limitations of a step-up booster is the maximum input current. If you want to achieve a high output voltage with a low input voltage (a high boost ratio), the input current would be many times the output ...


5

Pin 2 is not grounded so it does not work.


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