In article ,
mentioned...


Watson A.Name \"Watt Sun - the Dark Remover\" wrote:



The resistor should never have been run at that close to its maximum
dissipation to begin with. That's a lack of what they call a
conservative design.

That's exactly right-and this story about "it worked right during
production testing" points up the fact that the price you pay for
misapplying a component is extended in-house testing designed at a
higher skill level than the usual application engineer possesses.

I worked for a small company that was owned by a conglomerate. The
conglomerate said that they'd never use any of our equipment that were
in a blue case. Which, since almost everything was in a blue case...

Anyway, we had problems with the 7805 regulators shutting down from
overtemp. They were mounted on the PCB with a small heatsink. So we
had to ECO them by adding a few inches of wire and bolting the 7805 to
the aluminum case, which soaked up plenty of heat. After that, no
more weird behavior.

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