Re: When should a power supply be declared Perma-Dead?

["Henry" <apl2research(.a.t.)comcast.net>]

Hello Michael.

Actually, I've done a little research in to this issue.  I did short an old 
Motherboard and then a card to see what would happen.  Luckily no damage.  I 
know on a PC board it's almost impossible to smoke a trace, at least in the 
new machines.  Traces on a new MOBOs are VERY small so I believe the newer 
Power Supply's have a 'surge' circuit built in to them to prevent a massive 
instant load, such as a short, from allowing to occur.  I was also worried 
that the Floppy Drives in an Apple might 'trip' the Power Supply but haven't 
had an issue yet.  If you do have a short the Power Supply won't turn on or 
if there's a short while the system is running the Power Supply instantly 
shuts off preventing any damage.

Not to toot my own horn too much, but for the money the 200w Power Supply is 
really quite a nice unit.  Probably even a nicer unit then what comes in the 
most current Dells.  It's actually a U1 Rack Mount Server Power Supply 
board, hence the -5v line still active - or so I've been told.  I'm just 
glad the manufacture sells a lot of them otherwise their price would be sky 
high.

-- 
Henry S. Courbis
www.GSE-Reactive.com
Apple II Series Legacy Hardware - Come take a look at what we have to offer!

"Michael J. Mahon" <mjmahon@aol.com> wrote in message 
qJqdndfluJfQV-HZnZ2dnUVZ_sCdnZ2d@comcast.com">news:qJqdndfluJfQV-HZnZ2dnUVZ_sCdnZ2d@comcast.com...
> Henry wrote:
>
>> Most cards will actually fry a trace right off the board in a nice cloud 
>> of smoke before the power supply trips, unless it's a REALLY wide trace. 
>> Don't ask how I know this! ;-)
>>
>> We also sell a heavy-duty 200w Power Supply for the IIe if you'd like to 
>> give it a try.  It won't turn on if there's a short either. (shameless 
>> plug!)
>
> That is one downside to using a high-powered supply with an Apple II--
> if a card shorts, you will most likely blow a trace, not a fuse.
>
> -michael
>
> Parallel computing for 8-bit Apple II's!
> Home page:  http://members.aol.com/MJMahon/
>
> "The wastebasket is our most important design
> tool--and it is seriously underused."