>This is a point indeed. I was planning on using a transistor
>as well, coupled to a tiny SOT23 such as MCP9800. I can't
>actually think of anything "faster" than a transistor to heat
>up, I mean... a lamp or a resistor sounds slower to me...

Why use a seperate temp sensor? Can you not measure the Vbe drop to get a 
measure of temperature? You already have connections to it. How absolute 
does the temperature measurement need to be? 

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