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

John Francini francini at mac.com
Mon Oct 22 14:32:22 CDT 2007

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?


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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