Another degradation path I've seen too many times for NdFeB (Neodymium
"super magnets") is that they corrode and turn to powder, especially the
cheap ones from the Far East. The problem seems to be that the protective
plating applied is too thin to do any good.
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On Friday, July 22, 2016 at 10:07:56 AM UTC-7, Alic wrote:
>
> after some testing I found that there still is another limitation : the
> "shipping to" setting.
> And for this setting there is no worldwide option.
> This means that I can't see an article that only ships to USA and another
>
There are tricks I've discovered that allow one to see items that don't
ship to their country in ebay searches. One parameter that ebay fortunately
currently does NOT check with respect to location restrictions, is your IP
address. So, besides setting the "worldwide" radio button, other ways
Just an update. A 100pF cap over the resistor has indeed fixed the issue.
> Noise on the FB pin is a common problem with poor layout, hence asking for
> a look at it.
>
I thought my layout would be ok. Maybe I'll remove the ground-plane keepout
under the inductor next time as I'm using a
Physical shock will also do them in!! Ira.
On 7/23/2016 3:10 PM, gregebert wrote:
Permanent magnets will degrade (for lack of a better word) over time,
and factors such as an opposing magnetic field will accelerate this.
More details on physics forums, but it seems intuitive that external
Permanent magnets will degrade (for lack of a better word) over time, and
factors such as an opposing magnetic field will accelerate this. More
details on physics forums, but it seems intuitive that external factors can
disrupt the alignment of atoms thereby reducing the magnetic field.
I
Can anyone who has knowledge about magnets say what will happen to them
over time, especially when they are near electromagnets transferring power,
will they weaken and become unstable so the design will tilt or fall, and
how long will it take to weaken the magnets?
/Martin
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