Hi all,

first post.

I am trying to use a CA3140E op-amp as a comparator.
The two inputs are chemical sensors. The difference voltage between them
can range between 400mV, to 50mV (100% concentration to 0% concentration).

I remember reading somewhere in a text book, that if V1-V2 is greater than
(I think) 100uV the op-amp will go into saturation.

Can anyone a) clarify this for me, or b)suggest a better way to measure
the difference voltage.

Component count is a factor, as is power consumption. (I want my cake and
eat it too!)

TIA
--
rgrds,
Bernard

--
Bernard Tyers*Dept. of Physical Sciences*Dublin City
University*P:01.7005273*L:N117*W:frank.physics.dcu.ie/~bty

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