9 May
2012
9 May
'12
6:22 p.m.
On Wed, 2012-05-09 at 12:02 -0400, gene heskett wrote:
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