[rescue] Old PSUs & boards: useful to teach self?

[Robert Darlington]

It's either an inductor or transformer.  I didn't look at the picture,
but it can't be much else.

On 10/22/07, John Francini <francini at mac.com> wrote:
> If the power supplies haven't seen A/C in months or years, opening
> the PSUs should not be a problem.
>
> It's a question of whether the filter capacitors in the power supply
> still have any juice in them; after long enough, it will all leak away.
>
> The donut is likely to be a choke or coil of some sort; often they're
> used for things like RF suppression.
>
> Someone more familiar with electronics want to comment?
>
> j
>
> On 22 Oct 2007, at 15:06, William Enestvedt wrote:
>
> > So I have this old Sequent chassis that's getting tossed, and I
> > decided
> > to take a look inside: how often does a liberal arts guy like
> > myself get
> > to pick through such a pile of circuits?
> >
> >    Anyway, I have a few questions for any bitheads/gearheads on this
> > list that are willing to help me broaden myself:
> >
> >    1. Will opening the PSUs kill me? Is there anything in there to
> > see?
> >
> >    2. What is that one component on a SCSI board that looks like an
> > inch-wide doughnut wrapped a few times in heavy copper wire? I STFW
> > and
> > I can't find an Idiot's Guide To What That Electronic Thing Is (though
> > there are links to damn near everything else at:
> > http://amasci.com/amateur/elehob.html).
> >
> >    3. Is there anything worth scrounging from this beast in the way I
> > get good magnets out of old HDs, or spare RAM? No, the CPUs are long
> > long, though the terminal is up in the Data Center acting as a head
> > for
> > my V890s & T2000s. :7)
> >
> >    Thanks in advance.
> >
> > - Will
> > --
> > Will Enestvedt
> > UIS Database Team Lead & Unix System Administrator
> > Johnson & Wales University -- Providence, RI
> > _______________________________________________
> > rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
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