Nice read.
http://mathscinotes.com/2011/12/potentiometer-math/ (http://mathscinotes.com/2011/12/potentiometer-math/)
On the one hand, it's neat to see people reengineer something from the ground up, but on the other it's frustrating to read that someone's going to reinvent the wheel because they didn't like the size of the tires they picked out.