LTSpice Potentiometer?

[kouiky]

Hello, I'm looking to simulate a potentiometer in LT Spice and while there are a few netlists available on the internet, getting Spice to use user-made or even downloaded files has been difficult. Has anyone had success with this?

[EssB]

Yes. I use potentiometer_standard.lib from the LTspice yahoo usergroup. Here's a post how to get it:
good circuit analysis program - Single Post

[jcx]

what is the use - do you need "live" control of ratio during sim or just a setable/steppable ratio?

for the latter just use the parametric value defintion for a pair of R with the curly braces, and a .param for the setting variable

R1 value = {10k*(1-a)}

R2 value = {10k*a}

with a spice directive like one of:

.step param a list .1 .3 .6 .9

.param a = .5

you can even draw a rectangle around the R pair if you like it pretty - without needing .asy, worrying about lib management

[Calvin]

Hi,

I´m mostly using the pot_lin from this *.asc of the Yahoo-LTspice group
Just follow the instructions on the asc schematic sheet.

jauu
Calvin

[EssB]

Originally Posted by jcx

what is the use - do you need "live" control of ratio during sim or just a setable/steppable ratio?

The pot symbol looks nicer on the shematic, also you can set log pots by rotation without calculating/guestimating the R values.