[sdiy] tempco resistors

[Paul Perry]

I'm surprised that there should be a + - 10% tolerance for the coefficient,
considering that pure copper is pretty close to 3000ppm anyway.
Maybe we should go back to ovens!

paul perry Melbourne Australia

-----Original Message-----
>What is probably more important is the tolerance of the TC itself. 
>+/-10% is not uncommon, ie +2700 to +3300ppm/K, and this is not easily 
>trimmed.
>Tony
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