PSpice help needed

meara.london 20 years ago

I've started using PSpice as part homebrewing and design efforts. It is very interesting, and a great way to check out ideas before committing them to actual PC boards.

Some questions:

The version I downloaded has some limitations in the parts libraries. For example, I can't find many of the common parts used by ham homebrewers: MPf102 JFETS, NE602 mixers, etc. Where can I find the PSpice models of these parts? Has anyone developed a library of ham homebrew .MOD files for the parts we use?

I've (sort of) figured out how to put an impedance matching transformer into the circuits. I select what they call a "non-linear" transformer (bad name I think) and this allows me to set the coupling coefficient and the turns on the primary and the secondary. But what about the core material, toroid vice no-toried, bifilar windings, etc. Is there a way of plugging in the kinds of toroids we use?

Also, I'd be interested in hearing from other amateur homebrewers who are using Pspice in their solder-melting activities.

Thanks and 73

Bill N2CQR M0HBR CU2JL

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John Popelish 20 years ago

There is a very active Spice group (though focused on LTspice, free from Linear Technology) in Yahoo Groups, but they have a few thousand subscribers, many well versed on all aspects of Spice. You might consider joining that group to get answers to your Spice questions.

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xpyttl 20 years ago

Chuck Adams has a lot of spice models for typical homebrew components available on his web site,

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He has a nice tutorial in the QRP Homebrewer, I think you can still get issue number 5. Also, the QRP-L archives CD has a lot of models (they may be mostly the same as Chuck though). The CD is available through QRP-ARCI.

Most manufacturers provide models of their parts, so often googling the part number will land you on a spice model.

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Johnson 20 years ago

check out the banter at the sci.electronics.cad newsgroup -- you can also google spice models

oh, for transformers -- use a current dependent voltage source -- then you can add coupling capacitance, primary and secondary leakage inductance etc -- unfortunately it works down to D.C.

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