Originally Posted by
mackrackit
Thanks. I don't have any trouble working out the divisor so that it wont go over 5v for my input range. It's the impedance that I was worried about (but still want to minimise wasted current).
It's a shame that DT's calculator there doesn't have the impedance in the result. I have yet to find confirmation elsewhere that the input impedance is the parallel impedance of the 2 resistors. It seems a little counter-intuitive to me. If anything, I would have thought that it would be the series impedance.
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