Labcenters Proteus / Aries suite is pretty good, not freeware but has a fairly professional feel, the prices are reasonable. http://www.labcenter.co.uk/ tom.adam at telenet.be wrote: >What simulation software you guys use for trying out new idea's? >Or is this "not done"..... > >Looking for a lite version, preferably freeware ;-) > >Cheers, > > >