Hi -- > > Stuart this is more your area. I am interested too? Is there a tutorial > on using gschem, gnetlist, one of the spice packages and then a wave > form display package?
The best we have is the documentation I pointed to here: http://archives.seul.org/geda/user/Jan-2006/msg00073.html The "all about circuits" website has useful info about SPICE in general: http://www.allaboutcircuits.com/vol_5/chpt_7/index.html However having looked at Marc's circuit, I suggest -- with all kindness -- that he do a little more reading about power supply design before he gets too involved with SPICE. Then, he will need to learn more about SPICE itself too. To start off, on the circuit sidethe secondary of his transformer will be a short for 1/2 of every cycle. (Look at how D1 in his first schematic is wired across the secondary.) He also has a LED shorting the nets he thinks are the power/GND rails. On the SPICE side, well, he doesn't know it but SPICE doesn't have models for transformers. YOu need to create two inductors and then define a mutual inductance. It's not for newbies. Also, he has a Zener in the circuit -- again not a SPICE native component (although you can gin one up by playing with the .model paramters ... not for newbies. Finally, he doesn't have a GND, which is a SPICE 101 no-no. There are many other basic errors here. I suggest that Marc do a little more reading and then come back. The difficulties he is experiencing are not due to gEDA being "hard to use", but are rather because he needs a little more knowledge. I suggest he go out and buy "The Art of Electronics" by Horowitz and Hill, which is a most excellent introduction to electronics. http://www.amazon.com/gp/product/0521370957/qid=1136572727/sr=8-1/ref=pd_bbs_1/002-3632161-7873654?n=507846&s=books&v=glance Looking forward to hearing from Marc again after reading Horowitz and Hill, Stuart
