[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.




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