What is a Sigma-Delta AtoD converter? [EE]
Walter Banks email (remove spam text)
> From: Alice Campbell <LO.SCSENG.COM> 1502amc
> And try as i might, a pot just doesnt seem to work well in
> this circuit. When i get a chance, i will investigate
> further, but i have not been successful in getting it to read
> a pot. It really likes to work with an opamp.
The opamp isolates the circuit from the pot.
When you are using a pot as a reference then you
need to account for the fact that the output
impedance of the pot varies with voltage.
As Scott said the input impedance is quite low
but we and many of our customers have used this
in commercial products.
See also: www.piclist.com/techref/index.htm?key=
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