[time-nuts] Thunderbolt Supply
EWKehren at aol.com
EWKehren at aol.com
Mon Feb 14 20:58:19 UTC 2011
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,
hmurray at 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.
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