Michael from Acidbourbon writes:
This article covers the attempt to build a digital logarithmic potentiometer out of two linear potentiometers. The benefits of this concept
- Linear digital potentiometers can be easily procured and don’t cost much
- There are IC packages with two or four modules inside anyway
- The resulting logarithmic potentiometer is very flexible in terms of number of steps and steepness of the attenuation function
Full details at Acidbourbon homepage.