LTSpice Potentiometer Model ..#2

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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
26,721
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?


1615533942471.png
 
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