Anyway, today
I had to crack open the wall-wart that powers it, a simpl=
e=20
13.5V (nominal) thing. Crack open being right,
it's gleud together.=20
Anyway, I had 2 suprised :=20
=20
1) The trnasformer hs an internal thermal fuse in series with the prima=
ry=20
-- this thing is safer than a lot of wall warts
out there
Hmm, most of them that gets imported here are build this way.
Yo uare lucky. Most of the well-warts we get in the UK have no intenral
protectio nt all, they rely on the 30A ring main fuse.... I am told that
the transformer is supposed ot burn out in a safe way if overlaoded, mu
expeirencie si that this does not happen, at least not until the thing
has got hot enough to melt the case and emit a lot of magic smoke.
It was fiding the thermal fuse that I regarded as a suprise on such a
cheap product.
There was a german company that build wall warts with
changeable thermo
I can rememebr the Philips radios and tape recorders with thermal fuses
slotted into the intenral mains transofmer, and instructions in the
service manual for yanking it out nad replacing it if it failed.
The PSU for my Philis G7000 video game (not strictly a wall wart, it's got
a short mains input lead on it) has both mains nad output-side fuses and
a thermal fuse inside. And in a screwed-together case so it can be
repaired. The wall wart for my LogicDart also has a separate (and thus
replaceable) thermal fuse on thge PCB, in a screwed-together case. But
such things are vey much i nthe minority now.
-tony