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LTSpice newbie

Discussion in 'Electronic Design' started by Jimbo, Feb 3, 2006.

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  1. Jimbo

    Jimbo Guest

    OK, I've just installed the newest version of LTSpice and have no idea
    what to do with the new update LTC.zip and there are two files in it
    LTC and LTC.slb What do I do with these?


    Also, there are no transformers in the library and I decided to simply
    create my own by making a subcircuit. I drew a new component with 4
    pins and saved it in the /sym/ directory as transformer.asy I set the
    attibutes as "block" and set the Prefix as "X" so I can make my own
    model. The model I'm using I found here:

    http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=6204

    Also, in the attributes I've set SpiceModel=Ratio and I plan to use
    this as the ration of input voltage to output voltage. How in the
    world do I draw the subcircuit and get it to be associated with the
    pins I've drawn on the symbol. Am I on the wrong path completely? Am
    I doing something wrong? I bascially know how to use the software for
    most things but I have no idea how to create my own subcircuits and/or
    import them.

    Is there a good webpage with a turtorial on it? The help file seems to
    assume experience with spice molders in general.
     
  2. Jimbo

    Jimbo Guest

    P.S. Where are the .mod files? Also, does LTSpice use them? What are
    they?

    HELP!!!
     
  3. Damir

    Damir Guest


    Hello Jimbo.
    Please go to this LTspice group:

    http://groups.yahoo.com/group/LTspice/

    Read the text on the first page carefully.

    Best Regards,
    Damir
     
  4. Damir

    Damir Guest

    First of all always read LTspice help before
    searching for the answer on the group.

    Best Regards,
    Damir
     
  5. Joerg

    Joerg Guest

    Hello Jimbo,

    Transformers in SPICE are done by using two or more inductors and define
    their coupling ("1" for the ideal tranformer). Look at the very first
    example "Transformer2.asc".
    Play with it, but most of all, read the instructions that come with the
    help file. Start with "Contents" to learn. If that's too over the top
    for you at this point I'd suggest to buy a book about SPICE. LTSpice
    does require some familiarity with circuit simulators. But heck, it is
    so much easier to learn than the strictly text based SPICE I started
    with in the 80's.

    Regards, Joerg
     
  6. Jimbo

    Jimbo Guest

    Thanks for the help guys. Learning all of this software is becoming a
    full time job in and of itself! Also, the PCB layout program I'm using
    may drive me to insainity! I guess it's time to start a brewing a few
    gallons of coffee for this weekend!
     
  7. Joerg

    Joerg Guest

    Hello Jimbo,


    Try Cadsoft Eagle. It's pretty easy, except maybe for the library editor.


    I guess it's time to start a brewing a few
    Nah, I'd brew a batch of pale ale.

    Regards, Joerg
     
  8. Jimbo

    Jimbo Guest

    That will be for the Superbowl. Funny that you mention that...me and
    my dad have been making our own beer. Making some electronics to
    control the process is next on my to-do list.
     
  9. Tam/WB2TT

    Tam/WB2TT Guest

    If you look around in the Help area, there is an option for printing out the
    whole manual. 104 pages for the version I printed.

    Tam
     
  10. Joerg

    Joerg Guest

    Hello Jimbo,

    I used to do that as well, back in college with a few friends. Until
    that day when we had stacked all the newly filled crates in one of the
    guys' dorm room. Sometime after midnight PHSSSSST ... KABOOM ... BOOM
    .... POOF. The Grolsch bottles we used were strong but obviously not
    strong enough for a bottle fermentation process.

    Regards, Joerg
     
  11. John Miles

    John Miles Guest

    Nice article in the last QEX on inductor modelling with LTSpice. You
    might visit arrl.org and see if they have the article up as a .PDF; they
    sometimes do.

    It's a shame no one has written an "LTSpice for Dummies" book. There's
    a wealth of information out there, but it's scattered around in mailing-
    list archives and poorly-organized docs.

    -- john
     
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