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Re: Ferrite Beads - Bad idea?



Original poster: "davep by way of Terry Fritz <teslalist-at-qwest-dot-net>" <davep-at-quik-dot-com>


>I thought they would not affect anything but maybe higher frequency RF 
>noise off the gap (which they do well).  However...
>Last week I noticed that they get quite warm!

         Yep.
         Ferrites work that way: converting 'high' frequencies
         to heat.  Used as noise filters (eg EMI/FCC
         Compliance) power levels are low, so heating is
         minor.  Used in high (rf) power environment, they
         can heat/overheat/etc.

         A related thought:
         Different ferrites are compounded for different
         freqs.  Many will have low loss at 'coiling' freqs,
         which can be a good thing, or a bad thing, depending
         on the objective...

         best
         dwp

...the net of a million lies...
         Vernor Vinge
There are Many Web Sites which Say Many Things.
         -me
...for he has read everything, and written nothing...
         A J Raffles