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Re: [TenTec] Orion II DOA

To: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Subject: Re: [TenTec] Orion II DOA
From: Kevin Purcell <kevinpurcell@pobox.com>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Fri, 24 Aug 2007 13:36:30 -0700
List-post: <mailto:tentec@contesting.com>
I don't know about this particular part on this particular board but  
I've done a similar fix for the original Apple Airport. It had badly  
ventilated case and runs hot but they didn't use a low ESR high temp  
cap for power supply smoothing. It would fail with clockwork  
regularity after 18 months of operation.

The problem was the same value and rating low ESR cap wouldn't fit in  
the space.

If the space is critical consider downrating either the capacitance  
or the voltage rating (assuming its overspeced on the latter).

In that case downrating the max voltage (it was a overspeced) to a  
"closer than one would like but still in the rating" value got a cap  
that would fit in the space.

On Aug 24, 2007, at 11:23 AM, Ron Castro wrote:

> I would recommend looking for low ESR caps that are rated for 105 C  
> temperature operation.  Looking over the Mouser catalog, stock  
> number 140-ESRL50V470-RC, manufactured by Xicon looks like a good  
> candidate, although I don't know if they will physically fit in  
> where the originals did.

Kevin Purcell

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