These mT3608 based boost converters seem like a good choice. This was the second time I've ordered them (previously from another seller who didn't have stock when I ordered). These items sold by Frienda are of good quality and they all worked as described and were well packaged. An added bonus was that the circuit design has been changed from the original so that the output voltage now increases as the adjustment screw is turned clockwise rather than vice versa as on the previous purchased model. I would definitely buy them again.
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