[Milsurplus] BB-490 test

Sun, 19 Jan 2003 12:17:41 EST

John & Group,

The wallwart charger for my 12 volt booster battery pack (one of those sold 
as emergency car starting batteries that I use to run my laptop at events) 
also quit.  While recharging the pack from a bench supply, I cut into the 
charger with my bandsaw and found the same thing that you did.  Except that 
the one in mine was white, not black.  I am sure it must be a thermal fuse.  
I jumpered it and closed the unit back up with OD ordnance tape and it works 
fine.  However, if I knew of a source for replacements, I'd open it up again 
and do the transplant.  Mine was electrically at one end of the windings.

In a message dated 1/19/2003 3:05:03 AM Central Standard Time, 
[email protected] writes: 
As a side note, the wallwart power supply that came with the unit went =
feet up.  It looked as if the primary opened.  I of course dissected the =
critter and found an unmarked small black plastic object soldered in =
series with the primary.  It looks as if it is at the midpoint of the =
windings.  Looks just like an unmarked .1 UF 50V PC board capacitor.  =
One of the square little black ones.  Anyone else see one of these?  I =
can't believe that they would capacitivly couple at 50 or 60 HZ in a =
transformer primary.

Robert & Susan Downs
Houston
<[email protected]>

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