Thanks for the extra info. I was thinking the wide voltage ranges listed by amazon reviewers on the other eTop unit that cost 2$ more, was due to variations within the tiny little pot itself, from unit to unit. I've tested several small 10k ohm finger twist pots for my Silverstone fm121 fans, and found lot of variability at the upper end, where they max out. These 10k ohm Silverstone provided pots while small, are 4 times bigger than what came on the MW clone's circuit board and I suspect the resistance range on the pots varies even wider.
15.3v is enough for most of my intentions, I think I worry more about the durability of the pot more than actually getting a finger turn pot for ease of precise adjustment.
It is however a bit difficult to zero in on the voltage desired, too easy to go past it. I found putting a pair of needle nose vice grips on the jeweler's flat head screwdriver allowed more precision than just twisting with fingers.
The POT looks like it takes a phillips head, but there is little depth to the receptacle. A phillips head will strip the plastic unless pushed firmly against it, whereas the flat head grips fine without downward pressure.
The pot is kind of elevated on three stilts above the circuit board and too much downward pressure when turning the screw might be detrimental.
Now that it is Quiet outside and in, I am finding the fan noise a bit annoying. The thing is now cool to the touch providing 2 to 5 amps, and the fan is still running full speed and I can feel the air flow from it few feet away.
I am keen to find out the CFM rating of the fan within, but since there is so much restriction in front of the fan's output, I bet when that restriction is removed, a slower, lower cfm, quieter fan could move just as much air through the unit.
