[sdiy] while we're talking about scaling & biasing etc

[ASSI]

On Sunday 24 May 2009, Jason Proctor wrote:
> indeed, that was test 2 :-)

Now, do test 2a and connect the pot to the same regulator/supply that 
the level shifter is on.

> >If the ADC works like this, then it's probably something to do
> > with the extra hardware.
>
> indeed. it must be something to do with the scale/offset stuff. but
> since test 1 succeeded, we're looking at something a bit untoward.
> which is why i'm thinking it has something to do with the separate
> regulators.

If test 2a is pass, I'd rather think that it's your level shifter 
itself.  More precisely if you've done the divide-by-two thing via an 
opamp gain lower than unity I would expect it to be oscillating.


Achim.
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