[sdiy] newbie bead question

[Bob Roesler]

Thanks Harry & Cynthia for the information!

Bob


> From: "Happy Harry" <paia2720 at hotmail.com>
> Reply-To: harrybissell at prodigy.net
> Date: Mon, 20 May 2002 16:58:54 +0000
> To: bobo at decapod.net, synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] newbie bead question
> 
> Ferrite bead.  Its a small 'lossy' inductor that will prevent
> very high frequencies from entering or leaving the board ...
> 
> these would actually ride on the outer skin of the conductors
> and are otherwise hard to trap or filter.
> 
> In many cases they are just a 'good idea'... but sometimes they
> are very necessary. I had a problem with radio frequencies riding
> into a (commercial) mixer via the ground sheild. Even SHORTING the
> input to ground did not help (as the signal was on the OUTSIDE of
> the ground sheild.
> 
> Ferrite beads (a big one in this case) sponged up that unwanted
> RF energy....
> 
> H^) harry
> 
> 
>> From: Bob Roesler <bobo at decapod.net>
>> To: sdiy <synth-diy at dropmix.xs4all.nl>
>> Subject: [sdiy] newbie bead question
>> Date: Mon, 20 May 2002 09:23:34 -0700
>> 
>> Hi all,
>> 
>> In a couple if mixer circuits I've looked at from Ken Stone and Tony
>> Allgood
>> there is a bead used in series where +/- power enters.
>> 
>> What exactly is a bead, and why is it used? I've looked in the index of The
>> Art of Electronics, and find no reference to such a thing. Nor in any other
>> publications I have laying about.
>> 
>> Can someone enlighten me here?
>> 
>> Thanks,
>> Bob
>> 
>> 
> 
> 
> 
> 
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