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Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Gah, bad I made no picture of the fun I had in the lab. I had to test an old Soviet AFC analizer (yeah-yeah, in Soviet Russia, the caps blow you :D). Of course I hit the switch with my very common and favorite "And now it's gonna go crraaack!" quote (came from the term of a thyristor invertor shoot-through lockup, which here is translated almost the same as "crack-through", so apparently we invented a term of "crack-out", which, of course, is a result of a transistor invertor shoot-through when they crack sending parts of the casing flying around). "Nah, why?" - my co-worker replied. The tube lighted up, I could see traces and things just felt even not to go wrong, excepting the trace slowly moving down (old capacitor leakage as I guess now) and some weird smell I thought to be dust etc (that device came from 60th iirc). After my second "How to get the goddamn trace back?!" question (the machine ignored my attempts to do it with the resistor handles) however the answer came loud and (un)clear - the blast was so loud it even rang in my ears for a while (couldn't scare me as I'm always ready for alike things). A bright shotgun-style flash, weird dense smoke with an even a bit enjoyable smell, a wasted fuse - and it's time to watch the aftermath. Was a sight to see - the floor had an oil mark of a few squares (the pattern of the ventilation grate it all was shot out through), and inside the box the huge el capacitor hull stood like a shotgun shell, with all the fill scattered all around. The biggest cap blow I ever seen!
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
When I was making my boost converter, I suppose the 1M dropping resistor failed, sending 400V into the comparator, which failed short, and sent 400V straight into this 555...
Registered Member #580
Joined: Mon Mar 12 2007, 03:17PM
Location: Melbourne, Australia
Posts: 410
I had a 555 go like that, when i looked at it under a microscope i found on the circuit inside some microscopic text TIxx (xx being 2 numbers i guess it was a year, i don't remember the numbers now)
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pics of blown Electronics.
