10 May
2012
10 May
'12
2:38 a.m.
On Wednesday, May 09, 2012 08:35:36 PM Ralf Mardorf did opine:
On Wed, 2012-05-09 at 12:02 -0400, gene heskett
wrote:
fortunately, the closest thing to a computer in those days was my TI SR-51.
Except for a few mainframes that cost millions, computers as we know them
now, were still a decade in the future, this was the '70's.
Could=cold=microscopic crack in the solder?
No a perfect looking joint had no contact to a pin, it only had conatct
to the board.
I'm not familiar with that particular diode.
However power rated
switching diodes that fast really stretch the limits of the
technology, so I would expect a higher failure rate for that compared
to the 3 to 20 microsecond recovery times of a more normal power
diode.
Indeed. the HER 303 with 50ns is the second fast diode we found. Thomas
searched a lot and found another diode with 25ns or similar fast. He
never has seen such a fast diode in another switching supply.
I don't have any experiences. Yesterday I learned it and why just one
diode is needed.
3 kilovolts peak
That's why I would like to live in a house with several stages of
overvoltage protection. Those spark gap thingys from the DYI market or
the same crap 100 * more expensive from the musical instrument dealer
won't help if this happens. Even if the peak would be slow.
Light bulbs and small equipment fuses didn't
last as long as they
should have for obvious reasons.
:
:D
And it easily could go through the computer too. Regards,
Ralf
Cheers, Gene
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