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Ferrite Beads was (Reverse polarity AND flyback protection)

2006-07-21 by Kathy Quinlan

Robert Adsett wrote:

>> 2) What is the purpose of the ferrite bead?
> 
> They can be used for EMI, I've not used one myself.

OK how do we select these, or are they just a one size fits most ?

People keep telling me to use them in SMPS designs, but I am still not 
sure what I need, also which leg has the bead ? (in some designs I have 
seen them on all legs ant thought it was more support that need)


-- 
Regards,

Kat.
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