Really I'm not proposing to go all that far in the beginning, just regular history based parametrics as far as duplicating and spacing repetitive components for example! I suppose we could say component types are usually already parametric as on= e can change a component value or footprint easily. What they don't offer is concurrent versions, where you can make and maintain one circuit and get multiple PCB versions just by adding a new configuration set! On Fri, May 27, 2011 at 8:52 AM, Michael Watterson wrote= : > On 27/05/2011 15:58, M.L. wrote: > > This is getting very complicated very quickly. Maybe not to us who > > design electronics, but to describe this parametrically with equations > > in a complete and unambiguous seems very very tedious and complicated. > > > > Electronic parametric EDA seems to be adding a time dimension to your > > example of parametric 3D modelling such as Solidworks. In Solidworks > > you create 2D drawings and extrude or cut. Now imagine if you not only > > had to design a single 3D part, but also describe how they interact, > > then add electrons and semiconductors that behave in non-mechanical > > ways. > > > > An interesting idea - > > It might be more complicated than just having the design engineer redo > > the calculations. > > Also > 200V fast diodes used as varicaps on VCOs > 1N4007s power diodes use as "PIN" forward bias RF attenuators, current > controlled AGC RF/IF amps > Transistor used in CE avalanche breakdown as pulse generator > temperature coefficient of a particular Zener used to track BJT or FET > on heatsink part of bias > > > We have a thing called Spice that's sometimes used. Some schematic > Capture packages can output to it. Most link schematic to multiple > package variants for PCB layout and even automatic 3D visualization of > product (Autotrax EDA, Eagle plug ins). Even Thermal modelling on some > packages. > Since about 1983 I've been using PC Schematic capture that outputs > netlist & parts for separate PCB package and BOM. > > If you have the money there is no shortage of good tools. > > Some good ones are cheap or even free. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 Tobias Gogolin Tel. Movistar (646) 124 32 82 Tel. Telcel (646) 160 58 99 skype: moontogo messenger: usertogo@hotmail.com Blog: http://zeitgeistensenada.blogspot.com/ You develop Sustainable Ranch Technology at http://tech.groups.yahoo.com/group/SURA-TECH an Open Source Electric Motor/Alternator at http://groups.yahoo.com/group/Performance_Axial_Flux and an Open Source Motor Controller at http://groups.yahoo.com/group/GoBox --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .