Hi Everyone Thanks so much for looking!
My names Mark and I am from Malaysia. Im a newbie and recent convert to the world of gEDA and have been really struggling trying to understand it all! I must have put in about 2 solid weeks of reading most of the gschem documentation. Slowly slowly I am figuring it out! I think one of the big problems is more that I am from a mechanical background and have little to non experience with EDA. Having said that, I really like the interface of gschem and hope to be able to get to use it well! Anyhows.... I am writing in to you all with the hope that some kind souls could help with a few things... The first thing is that when one looks thru Bill Wilson's really helpful gsch2pcb_Tutorial, there is a link to a library of transistor symbols and elements that Bill created. The URL is in the "Custom File Elements" section of the document: http://www.geda.seul.org/docs/current/tutorials/gsch2pcb/gsch2pcb-libs-20040110.tar.gz Unfortunately it leads to an object not found page. Would anyone have a copy of this library? This library is of particular interest to me as Bill discusses the problems of correlating all the various TO92 pin outs in gschem with PCB. My next question is about the Symbol Attributes. Lets say I wish to make a symbol for a BC550 transistor. As I would be using this particular device a lot, I would like to make this symbol as correctly as I can. So, if I have a BC550 NPN GENERAL PURPOSE TRANSISTOR, what are the preferred values to give: Device=? Description=? My guess is that: Device=NPN TRANSISTOR Description= BC550 NPN GENERAL PURPOSE TRANSISTOR Would this be correct or would you suggest some other values? My next problem is with the pins. I think what is most important is that the pin numbers of the symbol pins match the physical pin numbers of the particular transistor when placed inside the PCB. Difficult with TO92 as there are lots of em ;) As you know... these small package transistors have specific manufacturer numbered legs. In the case of my BC550, I have a Leg #1 (Collector), Leg #2 (Base) and Leg #3(Emitter). Does it matter say if pinseq=1 is where transistor Leg #2 goes? Can we attach any Leg # to any pinseq#? On the subject of pinnumber, what would a better approach be? Should I use values of 1, 2 and 3? Or would it be smarter to use values of E, B and C for my transistor symbol? On the subject of pintype for transistors, what should I be using? pas? I am uncertain how open collector and emmiter fit into the picture here. As I might wish to one day run spice... I would really appreciate some info on what values I should be setting for the E, B & C legs on my transistors. For pinlabel, would it be correct to say that I do not need to include this attribute unless I am connecting a particular transistor leg to another schematic somewhere else? Or do I need to include this attribute. If so.. what would I label them for the E, B & C legs on my transistors? Well guys... thank so much for your time going thru this. Really appreciate it! Regards Mark ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
