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spud scruffy lad wrote:
On 8 Jul 2004 09:16:53 -0400, (Scott Dorsey) wrote:

Well now I know what that thing is in my DAP-1 battery pack but how
would that help the simple fan circuit I was describing? The polyfuse
is normally closed- a short, if it were in parallel with my resistor
is seems like the resistor would have no effect, being shunted out of
the circuit and I would have noisy, full fan speed (but proper
cooling) as a normal condition. When it got hot (which it wouldn't
because the fan is roaring away) it would open and current would have
no other path and finally start going through the resistor and I would
then have low fan speed when I need full speed. We need the opposite
to happen, right? I'm probably missing the boat here as usual.
Thanks for your reply.

You can get 'em with both positive and negative temperature coefficients.
And also you can get traditional thermistors, which have a slow change in
resistance with temperature rather than the abrupt transition that the
polyfuse does.

I'll see if I can dig up a data sheet around here.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."

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