Regarding the snippet below paralleling the bulk cap with a ceramic addresses differential mode noise such as the vacuum cleaner, but it doesn't help against common mode noise that the cm choke and snap-on ferrite sleeve address. Line to ground or Y-caps will work with the cm choke and snap-on ferrite to attenuate cm spikes.
---------- >From: John Barnes <jrbar...@iglou.com> >To: George Stults <george.stu...@watchguard.com>, emc-p...@majordomo.ieee.org >Subject: Re: Voltage Spikes on Power Lines etc >Date: Thu, Mar 14, 2002, 5:16 PM > > A very basic precaution is to put ceramic capacitors in parallel with > the bulk electrolytic capacitors in your power supply, to short out the > high-frequency components of the spikes. A common-mode choke on the > input can also help a lot. To see if this would help, you can put a > snap-on ferrite sleeve around the power cord next to the power supply. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
