At the risk of getting reprimanded by Lee et al. and being sent back to school, what is the famous 2.5 D naming problem? Google didn't present anything useful on the first result page, therefore it doesn't exist. :-) Cheers, Stefan Zhou, Xingling (Mick) wrote: >Hi, > >I remember in physics we can estimate how much energy is needed for an >electron to escape the surface of a conductor and also the significant >difference between the speeds of electrons and light (EM waves). Some >people are trying to explain the phenomena intuitively by some >similarities. However, we could be easily confused by mis-understanding >the behavior of waves and particles and the relations. Is EMI caused by >the off-PCB electrons at all? Etc. From practical engineering point of >view, it may be O.K. However, from scientific point of view, we need to >be careful. There are some other similar situation in our society such >as the famous 2.5 D naming problem. > >Regards, > >Mick > >-----Original Message----- >From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] >On Behalf Of Kanakaraj >Sent: Monday, August 30, 2004 11:50 AM >To: pcb_user@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx >Subject: [SI-LIST] Re: 90 degree bend > > >Hi, >The simplest thing is that when you make 90 degree turns on the pcb >track, the electron moving in it cannot make sudden turns..( remember >inertia of direction in physics and a bus making a 90 degree turn at >full speed)... so some of the electrons will jump out of the pcb track >and will cause emi issues.. > >and Andy, Andrew, Ray anderson and the seniors will give you more inputs >on that. Well I am too like you. a beginner :-) Kanak > >----- Original Message ----- >From: "New Bee" <pcb_user@xxxxxxxxxxx> >To: <si-list@xxxxxxxxxxxxx> >Sent: Monday, August 30, 2004 5:19 PM >Subject: [SI-LIST] 90 degree bend > > > > >>Hi >> >>I am a new PCB designer. >> >>I have a silly doubt - really do not know if I ask it in this forum. >> >> >>why is it suggested not to have 90 degree bends for the traces while >> >> >routing ? > > >>If some one can give me the electrical/electronics and manufacturing >> >> >reasons I will be greatful to them > > >>If this is not the right forum to address this please let me know=20 >>where >> >> >can I ask > > >>Thanks in advance >>Kam >> >>Yahoo! India Matrimony: Find your life partner online. >> >> >>Yahoo! India Matrimony: Find your life partneronline. >> >>------------------------------------------------------------------ >>To unsubscribe from si-list: >>si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field >> >>or to administer your membership from a web page, go to:=20 >>//www.freelists.org/webpage/si-list >> >>For help: >>si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field >> >>List FAQ wiki page is located at: >> http://si-list.org/wiki/wiki.pl?Si-List_FAQ >> >>List technical documents are available at: >> http://www.si-list.org >> >>List archives are viewable at:=20 >>//www.freelists.org/archives/si-list >>or at our remote archives:=20 >>http://groups.yahoo.com/group/si-list/messages >>Old (prior to June 6, 2001) list archives are viewable at: >> http://www.qsl.net/wb6tpu >> >> >> >> >> > >------------------------------------------------------------------ >To unsubscribe from si-list: >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > >or to administer your membership from a web page, go to: >//www.freelists.org/webpage/si-list > >For help: >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > >List FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > >List technical documents are available at: > http://www.si-list.org > >List archives are viewable at: =20 > //www.freelists.org/archives/si-list >or at our remote archives: > http://groups.yahoo.com/group/si-list/messages >Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > =20 > >------------------------------------------------------------------ >To unsubscribe from si-list: >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > >or to administer your membership from a web page, go to: >//www.freelists.org/webpage/si-list > >For help: >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > >List FAQ wiki page is located at: > http://si-list.org/wiki/wiki.pl?Si-List_FAQ > >List technical documents are available at: > http://www.si-list.org > >List archives are viewable at: > //www.freelists.org/archives/si-list >or at our remote archives: > http://groups.yahoo.com/group/si-list/messages >Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > > > > -- Ludwig Systems Engineering Consulting - Design - Implementation WWW: www.ludwigsystems.com System Architectures - FPGAs - PCBs Ph/Fx: +41-43-355-58-73/74 Hardware - Firmware - Software ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu