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: > > 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. 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. > Regards, > Ralf Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> If you're happy, you're successful. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
