Spectrum Software
Industrial Strength Simulation




Spectrum Software has released Micro-Cap 11, the eleventh generation of our SPICE circuit simulator.

For users of previous Micro-Cap versions, check out the new features available in the latest version. For those of you who are new to Micro-Cap, take our features tour to see what Micro-Cap has to offer.




Questions and Answers


Question: How do I set it so that a first group of capacitors has value X uf, a second group has value Y uf, and so on. This will let me only specify X, Y, and so on.

Answer: Use symbolic variables. Add two or more pieces of text to the schematic like this:


Then set the VALUE attribute to X for the first group of capacitors, to Y for the second group and so on. Then you can easily edit the .DEFINE statements or even step the values of X, Y, ... in the analysis run.

The symbolic variables text can be placed directly on the schematic, in the text area of the schematic, or in the user file at Options menu / User Definitions so that the values are available to all circuits.

Question: I recently reinstalled Micro-Cap from the CD and now the changes I made to the Component library are gone. Is it possible to recover these changes as I spent a long time putting them in?

Answer: When you reinstall Micro-Cap, the existing Component library and Shape files (standard.cmp and standard.shp) will be overwritten unless you specifically deselect them in the Installation dialog box. If this has happened, you can restore the older versions since backup copies are made by the installer on the MC6 or MC7 folder as standard0.cmp and standard0.shp. If standard0.cmp and standard0.shp already exist due to a reinstallation, then the existing standard.cmp and standard.shp are renamed to standard1.cmp and standard1.shp.

The oldest files are those with a 0 in their name. The most recent files are those with the largest number in their name, and are the ones in use prior to the most recent reinstallation. It is these highest numbered files that you want to recover by renaming.

Simply delete or rename the existing standard.cmp and standard.shp files and then rename the standardN.cmp as standard.cmp and the standardN.shp as standard.shp, where N is the largest file number present. Do this from the desktop or DOS before running MC6/MC7.
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