On Wed, 23 Jan 2002 18:29:06 +0100, "Gruendel, Frank 3837 S-WF-RD6"
<Frank.Gruendel_at_de.heidelberg.com> wrote:
>
> Yes, this IS Newton related, because the outcome of this discussion will
> control whether I need to update my refurbishing instructions or not :-)
>
> > I am not really happy with the terminology for "thermistor" what is in
> > my opinion most likely a thermo-fuse and for "resistor" which should read
> > thermistor. Of course every resistor will change its resistance with
> > temperature, but while this is a side effect for resistors that may cause
> > trouble in your circuit, this effect is especially distinctive and
> intended
> > for thermistors, because they are used for sensing temperature.
>
> I'm inclined to agree. When I encountered this "thing" (which I so far have
> called a thermistor), I found a pdf datasheet where (I think) it was
> called a thermistor. I will look if I can dig it out.
> Is a fuse in the English language an element that can only cut a connection
> (because the wire in it has melted),
Correct. A fuse is a use-once device. Murphy tells us that to save the $0.05
fuse, a $20.00 part will blow instead.
> or would a component that cuts and
> re-establishes a connection be called a fuse, too? Personally, I would
> probably call a component like that a switch.
Way back in the '70s, that would be termed a self-resetting thermal
switch/breaker/relay.
> > and in my opinion you can leave it out with no doubt as
> > long as you use the original power supply or a power supply with less then
>
> > 9W power.
>
> If that was true, Apple wouldn't have put it in in the first place.
So long as they could depend on the 9W ps staying at its rated capacity. Is
it a switching supply or just a typical "wall wart" transformer? Switching
supplies have a failure mode where they go overvoltage! Depending on a
regulated ps to stay regulated is not prudent.
andy
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