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LTSpice newbie

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:

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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.

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

HELP!!!

Reply to
Jimbo

Hello Jimbo. Please go to this LTspice group:

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Read the text on the first page carefully.

Best Regards, Damir

Reply to
Damir

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

Best Regards, Damir

Reply to
Damir

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

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Reply to
Joerg

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!

Reply to
Jimbo

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

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Reply to
Joerg

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.

Reply to
Jimbo

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

Reply to
Tam/WB2TT

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

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Reply to
Joerg

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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Reply to
John Miles

Tam/WB2TT said

Yup,

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Reply to
Homer.Simpson

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