Searching \ for 'Another Power Supply Issue - reliability thinking' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/power/actodc.htm?key=power
Search entire site for: 'Another Power Supply Issue - reliability thinking'.

Truncated match.
PICList Thread
'Another Power Supply Issue - reliability thinking'
1997\08\11@031846 by Mike

flavicon
face
At 01:48 PM 8/11/97 +0930, you wrote:

>>No way - I know how they make these switch mode supplies and how the
>>transistors are treated prior to and during assembly - I wouldn't risk
>>the fire hazard. I've seen one go up and that was enough. I'd rather
>
>The power supply in mine has been running for about 3 years, more or less
>continuously.  Monitor is green, so it powers down and eliminates bulk of
>the kWh.  IMO, if it was going to fail, would have happened in first few
>months; a la bathtub curve.  All thats likely to happen now is a mains
>fault, and I've got some heavy iron taking care of that...  One good idea is
>to revers the fan and filter it, but make sure you clean the damn thing
>monthly or less.

No. What you seem to be operasting from is a sort of faith - best held in
terms of a dogma. I do not have such misplaced hope in the reliabilty of
electronics - we are realists aren't we ?

And you don't know when the other end of the bathtub curve will hit and
the bathtub curve is not 'L A W' it is only of statistical relevance and
bears little relationship to those random faults that can be traced back to
the way devices were treated during manufacture. Hewlett Packard did some
major report on this - anyone know where this is on the web ?

Would you want your house at risk because you hope your PC won't start
a fire because you have faith that it worked for 3 years 'therefore' it
won't fail catastrophically !?! Thats the sort of thinking that caused
the Shuttle debacle in which 7 people were killed - I might add it was a
heck of a bad management decision by nonengineering people.

Rgds (And yes I always wear seatbelts)

mike
perth, Western Australia

1997\08\11@042322 by Mike Smith

flavicon
face
---Original Message-----
From: Mike <spam_OUTerazmusTakeThisOuTspamWANTREE.COM.AU>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Monday, 11 August 1997 16:49
Subject: Another Power Supply Issue - reliability thinking



{Quote hidden}

is
>>to revers the fan and filter it, but make sure you clean the damn thing
>>monthly or less.
>
>No. What you seem to be operasting from is a sort of faith - best held in
>terms of a dogma. I do not have such misplaced hope in the reliabilty of
>electronics - we are realists aren't we ?
>
>And you don't know when the other end of the bathtub curve will hit and
>the bathtub curve is not 'L A W' it is only of statistical relevance and

So there's a 1 in 10 million chance it will cause a fire.  I take greater
risks than this crossing the road.  Thats just a figure I plucked from the
air - who knows what it really is?  A MTBF (catastrophic mode) would still
only be statistical.

>bears little relationship to those random faults that can be traced back to
>the way devices were treated during manufacture. Hewlett Packard did some
>major report on this - anyone know where this is on the web ?
>
>Would you want your house at risk because you hope your PC won't start
>a fire because you have faith that it worked for 3 years 'therefore' it
>won't fail catastrophically !?! Thats the sort of thinking that caused

If I believed it wouldn't happen I wouldn't insure.  But I do - against the
1 in 10 million chance.  I also have earth leakage circuit breakers
installed for the same reasons.  And a smoke detector - becoming mandatory
here.

>the Shuttle debacle in which 7 people were killed - I might add it was a
>heck of a bad management decision by nonengineering people.

That's a high profile example - similar incidents which kill far more people
are happening every day.  Aircraft disasters, ferry overloading, bad design
of alpine resorts (local to oz - recent), not to mention the 100's of car
accidents that are caused by mechanical failure.

>
>Rgds (And yes I always wear seatbelts)
>

But do you turn off the following when leaving your house - VCR, clock
radio, TV, microwave, hifi, fridge, freezer(ouch)?  These all operate whilst
in 'non-attended' mode.  Some would be a PITA to turn off every time you
left for a short duration - some not really possible (deep freeze)  They all
pose a risk though.

MikeS
<.....mikesmith_ozKILLspamspam.....relaymail.net>

More... (looser matching)
- Last day of these posts
- In 1997 , 1998 only
- Today
- New search...