> The op amp output is A*(Vni - Vi) where A is the open loop gain of the
> chip, Vni is the voltage on the non-inverting input, and Vi is the voltage
> on the inverting input. As A gets very large, to get a finite output
> voltage, Vni-Vi has to approach zero. The "difference between the
> inverting and non-inverting inputs" is which input voltage is subtracted
> from which. To get a positive output, Vni > Ni , though this difference
> may be in the millivolts or microvolts. For a negative output, Vni < Vi
>
> Harold

Harold,
(assuming this was directed at me), of course I understand that NOW.
But in my first semester of circuits, no one mentioned that - everyone
always said "just assume they're at the same voltage at all times".
- Marcel
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist