I'm trying to cancel wiper resistance of a 10 kΩ DiGiPot that controls output voltage of a switching power supply. I'm using MCP4131-103 that has 120 Ω wiper resistance @0% pot position. This wiper resistance limits the max voltage that I can get from power supply. In this post there is a method that I have simulated it in EasyEDA: But there is an issue! I want to use LM358 that is not a bipolar op amp both because I have it in my disposal and also it needs a single power supply (0-12 V) instead of (-6 to +6 V). So I tried this sketch that apparently is not right:

Can please someone tell me how can I reach a solution using LM358?

I'm trying to cancel wiper resistance of a 10 kΩ DiGiPot that controls output voltage of a switching power supply. I'm using MCP4131-103 that has 120 Ω wiper resistance @0% pot position. This wiper resistance limits the max voltage that I can get from power supply. In this post there is a method that I have simulated it in EasyEDA: But there is an issue! I want to use LM358 that is not a bipolar op amp both because I have it in my disposal and also it needs a single power supply (0-12 V) instead of (-6 to +6 V). So I tried this sketch that apparently is not right:

Can please someone tell me how can I reach a solution using LM358?

ANSWER:

THANKS to Andy aka for providing the solution, just adding the final sketch for documentation:

This sketch gives me all I want:

• POT@0% -> probe 3V
• POT@50% -> probe 1.5V
• POT@100% -> probe 0V

I'm trying to cancel wiper resistance of a 10K DiGiPot that controls output voltage of a switching power supply. I'm using MCP4131-103 that has 120 Ohms wiper resistance @0% pot position. This wiper resistance limits the max voltage that I can get from power supply. In this post there is a method that I have simulated it in EasyEDA: But there is an issue! I want to use LM358 that is not a bipolar op amp both because I have it in my disposal and also it needs a single power supply (0-12v) instead of (-6 to +6v). So I tried this sketch that apparently is not right:

Can please someone tel me how can I reach a solution using LM358?

I'm trying to cancel wiper resistance of a 10 kΩ DiGiPot that controls output voltage of a switching power supply. I'm using MCP4131-103 that has 120 Ω wiper resistance @0% pot position. This wiper resistance limits the max voltage that I can get from power supply. In this post there is a method that I have simulated it in EasyEDA: But there is an issue! I want to use LM358 that is not a bipolar op amp both because I have it in my disposal and also it needs a single power supply (0-12 V) instead of (-6 to +6 V). So I tried this sketch that apparently is not right:

Can please someone tell me how can I reach a solution using LM358?