I use ferrite beads the old ones where the wire goes through a round cylinder five times I get them from Radio Conrad item # 50 21 97 36, 16 cents each and capacitors followed by regulators. The regulators are close to the Tbolt the rest is with the batteries and switchers. Works fine for me and I have looked with my HP3561A and HP 70000 series spectrum analyzer and see no problem. More important I do some Phase Noise measurements on PLL's and have much better luck with switchers than 60 Hz keeping noise out. Bert Kehren In a message dated 2/14/2011 3:33:49 P.M. Eastern Standard Time, hmur...@megapathdsl.net writes:
Has anybody investigated simple L-C (R-L-C) filters rather than linear regulators? The SI-List recently announced a good paper on using ferrite beads. http://www.ipblox.com/papers.html (Currently, it's the top paper. In case somebody finds this in the archives, it's the one marked DesignCon 2011) Page 5 of the slides has the critical graph. A ferrite bead is resistive over a broad range of frequencies. -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
