The implementation of digital potentiometers allows a more flexible and powerful management of the analog traditional circuit, being these devices driven by microcontrollers. Having at one's disposal the analog original circuit, the challenge is to substitute the digital potentiometer in place of the traditional one, modifying as less as possible the chosen circuit itself. This procedure can not be carried on directly, since the digital devices intrinsically address some new problems to the designer. For instance, issues can be related to the digital potentiometers’ supply and the relation between the latter and the analog signals involved. Furthermore, the injection of zipper noise into the signal path is also a major issue.