Joel, in theory, yes. But being real physical things that cost money, for a given size device, the chemistry and winding configuration the values of the parameters you mention are interdependent. Be careful with ferrite beads. They can be quite useful. However, misapplied, they can do a lot more harm than good. Remember that at low frequencies they are linear inductors with very appreciable Qs. Steve At 11:33 AM 4/7/2006, Joel Brown wrote: >I often see recommendations in application notes for ferrite beads on DC >power lines. Sometimes a particular P/N is specified and sometimes just >an impedance is given. >Wouldn't I want to choose a ferrite bead that has the highest impedance >possible at the frequencies of interest, and that the current rating and >DC resistance are appropriate? Would the frequencies of interest be the >fundamental switching frequency of the part and possibly the 3rd and 5th >harmonics? >Thanks - Joel > > > >-- Binary/unsupported file stripped by Ecartis -- >-- Type: text/x-vcard >-- File: joel.vcf > > >------------------------------------------------------------------ >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 > ------------------------------------------------------------------ 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