[time-nuts] Thunderbolt Supply
Bob Camp
lists at rtty.us
Mon Feb 14 21:47:15 UTC 2011
Hi
Ferrite beads are wonderful things. I use them all the time.
For this application (main filtering between a TBolt and a switcher) - not a
good place to use them. You don't get enough impedance at the switcher
frequencies. There are better (and equally cheap) parts available.
Bob
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Hal Murray
Sent: Monday, February 14, 2011 3:34 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Thunderbolt Supply
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 at febo.com
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
More information about the time-nuts
mailing list