LT SPice models

[em07189]

Hi!

How can i get potenciometer and relay models, to apply in a guitar amp project?

 

[MikeMl]

Yahoo LTSpice group

 

[throbscottle]

https://groups.yahoo.com/neo/groups/LTspice/info

You will find various potentiometer models, just pick the one you get along with best.

(edit) Oh Hi Mike I didn't realise you'd posted the same link!

 

[MikeMl]

For a pot I don't bother with a library. I just put in two resistors where the upper resistor has a value {(1-k)*R} and the lower resistor has a value {k*R} where 0.001<k<0.999 and R is the end-to-end resistance of the pot. I would use .Param k=0.5, R=10K to model a 10K pot with the wiper in the middle. A plot of V(vsk) vs the value of k is shown.

Notice the non-linear behavior of a "loaded" pot:

 

[unclejed613]

there are also switches that are controlled by a voltage, you can use these as relay contacts.

 

[throbscottle]

Of course with a pot model you do get a funky symbol to play with. I've an idea there is one of them you can set as a percentage.

That's a good idea though Mike, I would never have thought of it. Amount of time I've spent adjusting PDs in LTSpice, could have been so much easier!