10 Aug
2012
10 Aug
'12
11:55 a.m.
Yes, that's what it turned out to be (a BA11-VA).
And after I
discovered I was using the wrong fuses (thought I had grabbed a 3A, but
it was a 2A) it stopped blowing them on powerup :). I now have a very
Ah.... :-)
I once had a considerably more evil problem. I had an SMPSU (actually
part of a small monitor) that blew the mains fuse sfotly at power-on. By
'softly', I mean it jsut failed, it didn't 'flash' or shatter. I
removed
the chopper transitor, the fuses continuied to blow,. so I thought the
fualt was i nthe bridge rectifier or smooting capcitors. Everything
checked out.
And then by chance I found it. You see, I ran out of fuses, so I went and
bought soem more. Fitted one of those, it held. Cacpaitors charged fine.
Refitted the chopper transisotr, it still ehld and the entire montiro
worked fine.
These wew 1A (IIC) anti-surge fuses. It turned out that the ones I'd just
bougth were a differnet brand ot the oens I had been using. The inrush
current must have been a bit high (perghaps the limiter thermsitor was
marginal or soemthing). One make of fuse would blow at that current, the
oterh didn;.
As I said, evil...
-tony