"snopro.olmstead23" (Surpher) asked how to add a potentiometer in LTspice.? Your message hasn't shown up here yet.? I guess Yahoo's servers are still working on it.? Please no need to send the same question over and over.
Potentiometers don't come with LTspice.? Nor with SPICE.
Consider whether you really really need one.? Electrically, a potentiometer is just two resistors in series.? Two reasons why you might want one anyway are:? (1) You want your schematic to look pretty; or:? (2) You want to .STEP your simulation through a range of settings.? Otherwise, I can't think of a reason for needing one, but there might be one.? If your circuit has a potentiometer and you don't need to do either (1) or (2), then just calculate the two resistor values, and you're all set!? Much simpler.
However, don't give up yet.? There are a number of potentiometer symbols/models that have been uploaded to this group's Files section.? Choose one, then stick with that one.? Start here:
? ? Files > Lib > Potentiometer
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or here:
? ? Files > Tut > Potentiometer
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and there are others too.? As I say, pick one and go with that one.
Your next step depends on which one you downloaded and plan to use.? This might help:
If you put the symbol file (*.asy) in the same folder with your schematic, then do this:
? (a) Open the schematic.
? (b) Go to Add Component.
? (c) At the top of the pop-up, there is a "Top Directory" with two choices: LTspice's library, and the current directory.? Change it to the current directory.
? (d) Now the potentiometer symbol is a choice and can be added to the schematic.
Whether you need to add a .lib file reference, that depends on the potentiometer you've chosen.? If you need to add a .lib file yourself, add the following to your schematic (as a SPICE Directive):
? ? .inc filename.ext
where filename.ext is the actual filename of the .lib file -- so it might be something like "potentiometer_standard.lib" or "potentiometer.sub".
The next thing is to right-click on the attributes next to the potentiometer symbol, to set its value and the amount of rotation you want.? Hopefully that's obvious, because it depends on which one you've chosen.
If you have already downloaded one of the potentiometer symbols and can't get it to work, then please provide more information.? Tell us exactly which one of the potentiometer models you chose.? Preferably, you should ZIP your schematic AND the potentiometer symbol file AND its model file, into one .ZIP file (that's .ZIP not .RAR or other!), and upload it to the group's "Temp" folder so we can see what you've done so far.? Then write another message saying that you did that.
Regards,
Andy
