> On 16/12/09 09:57, Goran Mekić wrote: >> Is there a way to recognize what footprint I need for an element >> other >> then printing them all and comparing it to real element? Let's say >> it's 2200uF polar cap. I know it's RCY*, but how to figure out what's >> *? Thanx! >> >> > > You'll remember the most common parts' footprint names eventually. For > capacitors, I'd recommend using the RADIAL_CAN set of footprints. They > are macro-based footprints, with their single argument being the > capacitor's diameter in mil (1/1000th of an inch). For example, a > capacitor that's 200mil in diameter (~5mm) would use the footprint > "RADIAL_CAN 200". Currently, the RADIAL_CAN macro supports diameters of > 200, 300, 400, 500 and 600 mil. This way you can simply use a vernier > calliper to measure your real-life capacitor's diameter and pick the > closest value for the footprint. No need to waste ink. > > Of course, an alternative method would be to find a way to print out the > whole footprint library at once on a single sheet (with the footprint > names included!); if you keep that sheet safe and clean, you can simply > use it for reference without having to print stuff out more than once. > > Note that useful macro-footprints exist for other parts than capacitors > as well; you can use AXIAL_LAY (300|400|500|600|800) for resistors and > axial capacitors or inductors, and DIODE_LAY (300|400|500|600|800) for > diodes (but keep in mind that DIODE_LAY has pin 1 as the cathode and pin > 2 as anode). > > IC footprints, of course, are obvious (DIPn/SDIPn/SSOPn/TSSOPn... with > 'n' being the number of pins). Transistors, not so much. There appears > to be no proper standard for the pin layout of most transistors; e.g. a > TO92 package can be C-B-E, C-E-B, B-C-E, B-E-C, E-B-C or E-C-B for > bipolar transistors. The footprint, in this case, can simply be "TO92", > but you have to make sure the pins are properly matched between gschem > and PCB. > > As for more exotic parts, you're SOL. Often, you'll end up designing the > footprint yourself since there are no satisfactory predesigned ones. > This list can help you with that most of the time, though. > > -Peter > > > _______________________________________________ > geda-user mailing list > [email protected] > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user > OK, another problem with footprint. I can list files that belong to PCB package and filter out footprints, but I have no idea what to do with macroes. For example, I've stumbled upon bridge rectifier (http://www.gotwind.org/diy/images/Bridge_Rectifier.jpg or http://media.digikey.com/photos/Vishay%20Genreral%20Semi%20Photos/W005G.jpg), and because there's no element in pcb that looks like rectifier, I suppose there is a macro for this (just guessing). Is there a way to list macro footprints? Thanx!
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