I see a lot of instructions how to use a potentiometer as a variable resistor, but I can't find how to do the opposite.
I have a system that is controlled by the potentiometer. The potentiometer has three terminals: Low, High, Out (wiper). Lets say the resistance between low and high of the potentiometer is Rpot (which is constant no matter where the wiper is).
I need to control the output by using a variable resistor (Rvar), while keeping the resistance between low and high at a constant value - just like the potentiometer does (Rpot).
If I introduce the Rvar between the Low and Out, or between High and Out of the potentiometer, that would control the Output voltage, but at the same time it would keep changing Rpot, which I want to avoid.
Ideally, I would like to replace the original potentioimeter with a voltage divider in combination with a variable resistor, but I can't find where to place Rvar so that it controls the Out, while keeping Rpot constant.
Is there a way to do this?
I have a system that is controlled by the potentiometer. The potentiometer has three terminals: Low, High, Out (wiper). Lets say the resistance between low and high of the potentiometer is Rpot (which is constant no matter where the wiper is).
I need to control the output by using a variable resistor (Rvar), while keeping the resistance between low and high at a constant value - just like the potentiometer does (Rpot).
If I introduce the Rvar between the Low and Out, or between High and Out of the potentiometer, that would control the Output voltage, but at the same time it would keep changing Rpot, which I want to avoid.
Ideally, I would like to replace the original potentioimeter with a voltage divider in combination with a variable resistor, but I can't find where to place Rvar so that it controls the Out, while keeping Rpot constant.
Is there a way to do this?