Handy. Measured to 90% efficient at 3.3V/2.1A @14.4V in. The potmeter is rather inaccurate to set. Using the resistor selections at the bottom works well but the PCB trace to the potmeter has to be cut then, otherwise the potmeter is there for all the voltage selections (or remove the potmeter completely, which is perhaps the best to do...). Bit of a design flaw.... MPS MP2315 is used as Buck regulator.
All is OK.