Is there really....any technical advantage to using two side by
side photocells (misc variety in a differential bridge), as opposed
to using just one alone?  I'd think one cell would be simplier
mechanically but I'am not sure if it would react the same
circuit wise or as well (?) as two cells.

Its kind of relivant, as I'am on a large bright LED and single
CDS (photoresistor) sensor project at the moment...which could
be changed over time. 

Meredith Lamb

George Harris wrote:

>
> The very simple and quiet photosensor system can be made from a bright,
> large LED and
> two small silicon solor cells.  The cells are placed side by side and
> connected in parallel
> opposing across the + and - inputs of a quiet opamp. (I use OP 77's).

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