[Gllug] Power Supply loaner in West London?

[Phil Reynolds]

On Thu, Sep 23, 2004 at 06:37:10PM +0100, Chris Bell wrote:
> On Thu 23 Sep, Phil Reynolds wrote:
> > 
> 
> > 
> > I am a bit out of your area but there is nothing to stop me bringing you
> > a PSU.
> > 
>    From Sheffield?
 
No - from Colindale.

> > One point to check - I have noticed this on P3 and P4 boards - are all
> > the electrolytic capacitors looking normal or is there any kind of
> > swelling, corrosion or leakage? I have had three boards go down within
> > the last 18 months with this definite problem.
> > 
>    Is this happening on boxes with well loaded PSU's or just light loading?
> Electrolytic capacitors are good at low frequencies but tend to complain
> when there is a lot of HF around. The computer relies on steady power rails
> despite swiching at very high clock frequencies, while switch mode PSU's can
> go unstable with very light loading. It used to be standard practice to add
> a small non-electrolytic capacitor alongside to cope with the HF, while
> boards with large area multi-layer power rails are supposed to cope better
> by acting as a distributed capacitor.

Purely random - totally different styles of use. It is often due to
actually defective capacitors - Abit boards are particularly prone but
two of the ones I have dealt with were Jetway.

-- 
Phil Reynolds
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