[sdiy] (sot) Oh yeah... you think so ???

[harry]

Well LAST week we had a 1200A Inverter (welder) go... we suspect it was a
defective cap (judging from the size of the crater in the windings... it blew
from
deep within).  Two 3300uF / 425V electrolytics (out of a bank of eight) went...
with 700VDC applied.

That were no wimpy M-80. That was a hand grenade.  It blew the laminated copper
bus bars out over an inch.  No one was hurt... butI bet the operator needs new
BVD's....

OK top that one  (I'm sure someone has a nuclear story to share....)

H^) harry

patchell wrote:

> Colin Fraser wrote:
>
> > > -----Original Message-----
> > > From: owner-synth-diy at dropmix.xs4all.nl
> > > [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Grant Richter
> > > Sent: 27 July 2001 18:14
> > > To: owner-synth-diy at dropmix.xs4all.nl; Dr Strangelove
> > > Cc: synth-diy at dropmix.xs4all.nl
> > > Subject: Re: [sdiy] Re:Need Some Advice
> > >
> > > Do not put the chips in the first time under power!
> >
> > This reminds me of something I do which is probably good practice - wear
> > safety glasses the first time you power up an untested circuit.
> >
> > I have fortunately only heard the whistle of IC casing as it flew past my
> > ear, never the sound of it hitting my eye...
> >
>
>     Worst one I ever had was a 330uF 10V cap that was the bulk bypass cap on
> a DSP card.  The assembler put it in backwards....even under the best of
> conditions, this is not good, but the system had a 300Amp (yes, three hundred
> amps) power supply, and when I flipped on the power, boy did that baby
> blow....sounded like an M-80, made a big bright flash.  All that was left
> were the two legs soldered into the board.  The only remains to be found were
> little tiny peices of epoxy embedded in the cables for the logic pods
> connected to the board.  Only thing that saved me was the power switch was on
> the opposite side of the rack.  Back then, safety glasses were only for wimps
> and bedwetters as far as I was concerned (I have since reformed).
>
> >
> > Colin f
>
> --
>  -Jim
> ------------------------------------------------
> * Visit:http://www.silcom.com/~patchell/
> *-----------------------------------------------
> *I'm sure glad Merry Christmas comes just once a year
> * -Yogi Yorgensen
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