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Discussion in 'CAD' started by ivan, Mar 28, 2007.

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  1. ivan

    ivan Guest

    [sorry for the x post]

    hi all,

    what is a good free spice program?
    possibly with a large opAmp library....

  2. Guest

    LTSpice from Linear Technology ( is hard to
    beat. I think they actually call it SwitcherCad 3.

    The built-in op amp library is restricted to parts that Linear
    Technology makes or second sources, but that is a pretty comprehensive
    selection, and it is easy enough to pick up Spice models for other
    manufacturers op amps from the manufacturer's web-site. Finding out
    where to put these models so that LTSpice can find them is a bit
    trickier, but you can ask for advice here or on sci.electronics.cad.
  3. Paul Burke

    Paul Burke Guest

    I just put them in lib\sub, is that wrong?
  4. JeffM

    JeffM Guest

    Either don't cross-post or don't apologize--don't do both.

    Learning to use a search engine would be a good skill for you acquire.
    This has been asked
    and answered
    MANY times before:

  5. Hello Paul,

    It's ok in principle.
    It's the first place where LTspice looks for a model file if you don't
    specify the full path.

    I prefer to save models and symbols always into the same directory where
    I have saved my schematic. If I need a model in five different designs, I
    save it into everey design directory. This makes it very easy to archive a
    I just zip all the files in the design directory, except the ".raw"-file of

    Best regards,
  6. ivan

    ivan Guest

    how do you rotate/mirror parts in LTSpice?

  7. pick the part up with the open hand, use CTRL+ E, CTRL+R

  8. LTSpice comes with a nice manual. And for those that don't want
    or can't read, there are icons in the editor window that represent
    rotating and mirroring (using a captial letter as an example though,
    so I guess we're back at square one for the illiterate).

  9. jasen

    jasen Guest

    ctrl-R / ctrl-E or the E->m or E->3 icons on the toolbar
    or rotate/mirror from the edit menu.

    Do it before pasting (from the library) or after selecting part(s) to divide/drag

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