On Saturday 27 December 2008, Robas, Teodor wrote: >Do not count on this kind of capacitors: > >http://deep-blue.ro/tmp/chinese%20capacitor.jpg > >:))
What a ripoff. No way in hell that would last more than a day, if that long with 50 volts of bias on it, (I'd guess 10 minutes max) and I'd have doubts even the dual can would contain the debris. I take it you got curious when incoming QC said they weren't in spec? BTW, that is a neat opening of the can you did. They can explode pretty violently, so let me tell you a story. Back in the mid-60's I came across a tube type, mobile cb radio that had to be one of the few attempts to build one for a 6 volt vehicle system, and predated the old Johnson whiteface by probably 10 years. My pickup at the time, a 52 ford, had long since been converted to 12 volts, and I was in the radio, on the kitchen table, moving wires to convert it to 12 volts. I missed one without realizing it, and had it running on a 12 volt supply for test. It worked really really well, talking to the neighbors on a piece of wire laying on the floor for an antenna. But after about 15 minutes the main filter capacitor let go, and the top of the can put a quarter sized print in the plastered ceiling that was about 1/4" deep. I'm glad I wasn't in front of it at the time, else I might have been seriously injured. I tried with a 20 oz hammer and could not put a dent that deep in that plaster with it. Putting my meter on the stubs of the cans terminals I found the supply was making a hair over 785 volts, and the can carried a 450 volt label. I cleaned up the mess, replaced the cap, and found the other 2 taps on the transformer that I had missed, and ran that radio till I finally got a transistorized one. But my kids, who were upstairs in bed at the time, have always said, somewhat tongue in cheek, that daddy was shooting at them. :) >_______________________________________________ >geda-user mailing list >geda-user@moria.seul.org >http://www.seul.org/cgi-bin/mailman/listinfo/geda-user -- 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) The best diplomat I know is a fully activated phaser bank. -- Scotty _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user