How to Build a Digital Potentiometer Circuit with a MCP4131 The difference is a digital potentiometer IC is controlled by software, while a regular potentiometer is controlled manually by a person. Just like a regular potentiometer, a digital Pot IC comes in all different values of resistance. The specific digital potentiometer we will use in this circuit is the MCP4131 IC. Digital Potentiometer - Working, Internal Structure Sep 22, 2017A digital potentiometer or a digiPOT (Electronic Potentiometer) as it is commonly called can be said to be a digital version of the mechanical potentiometer or a rheostat. It offers the same analogue functions as a rheostat or a potentiometer that is control of current or voltage.