I bought one of these cheapo Ebay toys from China. It's a buck converter with a Constant Current function. I plan on using to drive LEDs from an 18.5v 18650 li-ion battery pack.
One of the potentiometers adjusts the voltage of the output, and another limits the current.
My limited understanding of these devices is that the potentiometer controlling the voltage acts as a voltage divider. Scouring the forums tells me that most of the pots are 2K ohms.
The buck converter is based on the LM2596, for which the datasheet is here
Is it okay to replace the one voltage potentiometer with three 2K ohm potentiometers like this: with the blue pot in series controlling the maximum voltage and the blue pot in parallel controlling the minimum voltage, so that the brown pot controls the voltage within the ranges set by the two blue pots?
EDIT: I forgot to add that I know controlling the current is the best way to dim an LED, however, I don't know how the current limiting feature works. Does anybody care to explain please?