While we are all talking about bypass caps, I just got done reading a book by Bruce Archambeault called "PCB Design for Real-World EMI Control". In the book there is a chapter on bypassing and it shows measurements from actual test boards. In one case, a certain percentage of the caps are "high ESR" which seems to result in substantial damping (reduction) of the resonances. The high ESR caps are described as ceramic capacitors with a series resistor built into the package, I have been unable to find such a part. Has anybody found a benefit to this approach and a source for high ESR capacitors? Thanks - Joel ------------------------------------------------------------------ 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 technical documents are available at: http://www.si-list.net 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