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From: The Natural Philosopher <tnp@invalid.invalid>
Newsgroups: comp.os.linux.misc
Subject: Re: Uh Oh ... Newest Nvidia Chips OVERHEAT
Date: Thu, 28 Nov 2024 09:30:14 +0000
Organization: A little, after lunch
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On 27/11/2024 19:16, rbowman wrote:
> On Wed, 27 Nov 2024 12:46:12 +0000, The Natural Philosopher wrote:
> 
>> Imagine my surprise at encountering 'commercial design' where it was
>> sufficient if the thing worked between +10°C and +40°C and the customer
>> did the product testing, in terms of returned items.
> 
> My youthful idealism took a hit with my engineering statistics course.
> Much time was devoted to how many widgets have to be tested to insure only
> X% are crap, X being determined by the cost of replacing defective widgets
> versus the cost of doing it right.
> 
It's a very important part of engineering. I once tested 1000 
phototransistors to get an idea of the spreads.

It was a perfect bell curve with one end truncated. Except for two. 
Those were obvious rejects that had slipped through.

Another time I got a panicky call from my boss. PA amplifiers were 
popping like flies at a very important and well paid gig.

It turned out that on switch-on, the output hit the rails, and a relay 
had been fitted to stop the loudspeakers blowing up. Shit design. But 
anyway that put more voltage across the output transistors than they 
were rated for. 'But it always worked before' I tested all the 
transistors in stock. The whole batch were only marginally in spec.

(We left the amps powered up for 3 days solid to avoid switching  them 
on: once connected to a load the voltage sagged enough to be safe)

-- 
"First, find out who are the people you can not criticise. They are your 
oppressors."
      - George Orwell