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Sam DeRose on Instructables writes:
Last week in my college physics lab we got to use these variable resistance ‘boxes’. They had two inputs and six dials, and could generate one million different resistances across the two inputs. I knew I had to have one, and why not make it myself? This tutorial demonstrates how to build one for yourself for pretty cheap.
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But this will not actually give you 1,000,000 monotonically increasing values unless you use very high tolerance resistors — switching the high digits will have an error of many times the low digits.
Comment by Tom Davies — January 11, 2013 @ 5:59 am