I needed this to step up the voltage from 9v to 20v for a portable speaker project needed to step up the voltage from my USB PowerDelivery board which takes 9v up to 20 V to charge the on-board battery. It does the trick very well. It gets very hot and I'm sure it's not the most efficient in the world but for my use case it was perfect. Will buy again if I need something else in the future.
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