A nice circuit drawing engine, Spice simulator on steroids, with other things for tuning up filters, plotting Smith charts etc. Used to be about £5k per seat until spring last year. Now after nearly 40 years, it looks like the company owner is retiring or something, as it is all now being given away free as part of closing down, which must be  one in the eye to the likes of HP, MW office etc.

Effective 7/4/2019, Spectrum Software is closed. Micro-Cap is now free.


Technical support will be available for at least 90 days via email at Support.


You can download the latest versions of Micro-Cap here: Download

You can choose either the executable program or the entire installation CD

I have used a much earlier version in the days of DOS and found it very good (designing power supplies and op amp filters  in those days) but I could never justify buying it for personal use.

Not sure how long we have before the website folds.

Apologies to all those who already knew, I have just found out.

May well be worth down loading just to be able to draw nice circuit diagrams, even if you do not simulate them.  They look like this