[time-nuts] Thunderbolt Supply

[EWKehren at aol.com]

Achim
of course I am using Filters, among others the wide band inductors Radio  
Conrad offers. Contact me direct and I will send you sketches of what I do,  
including GPSDO with 10811. Where are you located?
Bert
 
 
In a message dated 2/13/2011 8:44:56 A.M. Eastern Standard Time,  
avollhar at physik.uzh.ch writes:

Dear  Bert and all,

maybe I missed it, but how can a linear regulator filter  out transients 
from a switched PSU? The cited LT1764A has less than 30dB  Suppression at 
100 kHz getting worse for higher frequencies.Even the  famous 7805 had 
only 50 dB suppression. For going to a real clean PSU, I  would expect 
some old-school filtering and screening should be fine.. or  am I wrong?

A classic 50/60 Hz all linear PSU has a bad efficiency, but  very little 
high frequency spurs to care about. For my current project  (GPSDO with 
double oven HP10811), I will only use those.. even the classic  LED 
7-segment display I am planning to use will not use multiplexed mode  but 
quasi-static (1 Hz update rate  only).

Regards,
Achim

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