Bob Blick ha scritto:
> A hot wire exposed directly to the air is pretty responsive. The wire
> material is also probably a relatively poor conductor of heat, so the
> temperature is not heavily influenced by the connecting wire. As opposed
> to a transistor, encased in plastic, with copper leadframe and
> conductors muddling the accuracy by bleeding heat into the thermally
> isolated parts of the device.

I see Bob.
I was considering a BD139-or alike, metallic case.
Since the sensor woudl be smaller (the aforementioned SOT), I should use 
something else. Or maybe move to a TC74 (TO220) and use a BDX53 BJT.

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Ciao, Dario
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Cyberdyne
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