A few years ago I bought an Electronic Lab program. I don't remember what it was. It had copy protection and that made it hard to use if you did not have the manual at hand. Well, I lost the manual and the floppy disks.
Now I see there are some free programs out there. Which are good? Here is a screen shot of one. That is enough to let yu know what it is. You make a diagram using standard items from a library and then apply poser and the software emulates what it might do in real time.
Do you know which ones a re both good and free?
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