On Fri, May 7, 2010 at 11:52 AM, Dwayne Reid wrote: > Good day to all. > > I'm marking up a very tight section of a schematic diagram where I > have room for only two characters. =A0I'm sure that I've seen a two > character marking scheme for tiny SMD resistors somewhere but I'll be > darned if I can find it. I've never seen a 2 character resistor scheme, but you surely have component identifiers (such as R23, R24, etc) - why not simply put an asterisk where the value would be displayed, and make a table in another section of the schematic calling these values out by component identifier? You're going to have to make a similarly sized table for the E24 --> letter code you're considering establishing already. Even if you find an established code, you should call it out on the schematic. It seems odd that you can't expand the section on another sheet, or rearrange things so it will fit though. I can only imagine the interesting requirements you have that necessitates this. But a straight letter to E24 value seems to be most appropriate if you don't find anything else. I'd consider removing the letters O and either L or I to avoid some confusion, since you've got extra letters you aren't using. Also keep in mind that you may cause more confusion by creating "values" with the descriptors "C2" and "R1" - you might want to put the magnitude number first, then the letter that denotes the E series value (2C and 1R). Even that's not perfect. Regardless it's going to be confusing. It seems that a BOM-like table elsewhere using the normal component identifiers is a better solution if you can do that instead. -Adam -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist