I need to provide a 2v input voltage to a POT. I thought about the attached diagram but realized that, as the pot changes it resistance, that the input voltage would also change. I need a steady voltage to measure the POT setting with the ADC. FYI: The POT is on a linear actuator and my ADC has a built-in reference voltage of 2v so anything higher flat lines. Any help would be much appreciated!

 

Does the pot have three terminals or two?

 

Does the pot have three terminals or two?

The POT has 3. +, - and ladder.

 

So your pot needs to go across the 2 V supply and the adc to the wiper and ground, this will give you a zero to 2V swing. I would use a regulator like lm317 set to 2V to give the precise voltage.

Would this work?

 

Ahhh, lm317 is the ticket. Thanks!