On 16/06/2011 06:19, Xiaofan Chen wrote: > On Thu, Jun 16, 2011 at 12:33 PM, Oli Glaser wr= ote: >> On 16/06/2011 03:36, Xiaofan Chen wrote: >>> On Thu, Jun 16, 2011 at 10:21 AM, Oli Glaser = wrote: >>>> So - what is the standard symbol for a power net? or what do people pr= efer? >>>> >>> We normally use a small triangle with an obvious net name >>> like VCC_5V. >>> >>> >> Thanks - I've seen that type too, and also one like an arrow. There seem >> to be (too) many different versions out there.. :-) >> Is the triangle symbol you use from a particular standard, or is it just >> an arbitrary choice made by your company? >> Unless someone knows what the current IEC or ANSI standard symbol is, I >> think I'll probably just go with what I know best (and seems most common >> in the schematics I've seen)) which is the T shaped one. > My colleague told me there is an IPC standard for this. Maybe > IPC-2612. > http://www.ipc.org/TOC/IPC-2612.pdf (table of contents only, > you have to pay for the standard. Right now I do not have > access to this document. > > She also told me the triangle symbol is the most popular. > > The following site shows two symbols (small circle and the Y > shape) for the voltage supply but then you can see it uses the > triangle for the global power bet in the example schematics as well. > http://www.frontdoor.biz/HowToPCB/HowToPCB-Schematics.html > The T shape seems to be not as popular and I only saw them in > some IC design type of schematics. > I have the older version here, I might pay to grab the new one at some=20 point. I guess as long as you are consistent within your company's schematics=20 then it doesn't matter much about the choice, as long as it's reasonably=20 well known. I may go with the triangle shape though, now you mention it I do seem to=20 recall seeing it quite a lot. Funny how the brain filters out things you=20 are not used to, I have probably "seen" the T symbol more often as it is=20 what I am used to using. This was just as much a curiosity to see how things had progressed as=20 far as the standardisation of symbol/designators/bus wiring etc goes. It=20 has certainly got a lot better in recent years, I have worked with a lot=20 of vintage (mainly audio) equipment, and deciphering some of the older=20 schematics is real detective work at times :-) --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .