Re: System Saver IIgs -- ID of burned part?

[Stephen Shaw <xstephenx@apple2.org.za>]

Whoops sorry I stand corrected :-)

On Sun, 01 Jul 2001 20:09:30 -0400, w_tom wrote:

>     "MOVs designed to absorb lightning strikes"   is exactly what those who
> promote ineffective plug-in surge protection encourage.   MOVs don't absorb
> or stop surges - made obvious just by reading MOV manufacturer's specs -
> the data sheets.  MOVs only shunt a surge from one wire to all others.  If
> that other wire is an input to your computer,  then the MOV has provided a
> surge with more paths to damage a computer.  It is why MOVs located too
> close to transistors and too far from earth ground may even make surge
> damage more likely.
>
>   Effective surge protection shunts a surge from one wire to earth ground.
> Ground that is less than 10 feet away.  Also surge protection is properly
> sized - another important factor obtained from  those MOV data sheets.
>
>   Many would have you believe MOVs age.  They degrade.  It is why the
> joules ratings are so important and why a plug-in surge protection - rated
> at 345 joules but only providing 115 joules  - is undersized.  There are so
> many half truths about surge protection.   One would say that surge
> protectors age - by forgetting to mention the 'aging' is only due to a
> grossly overpriced surge protector containing insufficient MOVs.   Surge
> protector life expectancy  increases exponentially with joules ratings.  So
> why do so many plug-in surge protectors forget to add sufficient $0.05 and
> $0.30 parts - and yet  charge $20 or $70?   Are they selling surge
> protection - or just an image associated with urban legends and with a
> common lie  - that  "MOVs designed to absorb lightning strikes"
>
> Stephen Shaw wrote:
>
>> These are MOVs (metal oxide varistors) designed to absorb lightning strikes
an
> d
>> other transients emanating from the power line. Radio Shack should have
>> replacements. These do age.

-- 
What is mind? No matter! What is matter? Never mind! - Homer S.