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

[Jason Proctor]

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

yeah that would have been logical while i was in there. but i'm not 
going to jump in and try things just yet. i'm hoping that there will 
be a consensus on the thread as to likely causes and then i'll 
develop a war plan. the board is packed and making changes is tricky.

>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.

really? wow.

<rimmer>
how come nobody mentioned this before?
</rimmer>

i'll get the scope on the pin today and see what's up.

thanks for the response,
j