# LTSpice Potentiometer Model ..#2

#### Lazer_Gebrino

Joined Mar 11, 2021
2
But to simulate a pot, you need to step two resistors such that their sum is constant.
It's easy to step the pot wiper position.
Just substitute "{w}" (with curly parenthesis) for the wiper position number (as below), and then step w (0 to 1) to step the wiper position.
View attachment 179721
Hi, could someone post a pic of this pot being implemented? I'm fairly new to LTSPICE and don't really know what I'm doing. Also, what is "wiper"? Thank you for your time!

#### crutschow

Joined Mar 14, 2008
32,843
The "wiper" is the moveable contact in a potentiometer that moves across the resistive track from one end to the other.
It acts as a resistive divider for any signal across the resistive ends.

Below is the LTspice simulation of a simple pot circuit with the pot connected between a 1Vdc source and ground.
The simulation shows the voltage divider output [V(out)] of the pot for the step pot wiper positions (W) of 0, 0.25, 0.5, 0.75, 1 (corresponding to the wiper being 0%, 25%, 50%, 75% and !00% of its position from the bottom to top in the schematic.
This then gives a wiper output voltage of 0V, .25V, .5V and 1V.

This pot has an end-to-end resistance (Rtot=) of 1kΩ.
The {W} in the wiper= can be changed to a fixed value of 0 to 1, to give a fixed pot wiper position for the simulation.
These can be changed by right-clicking on the value or the pot.

Make sense?