The cell is wired in just as the diagram shows. I am not smart enough to mess with the biasing yet!
Don't forget that this is a virtual earth config, so the cells are practically running short circuit.
At first I wasn't overly concerned with noise, since this preamp was for a flying spot scanner and would have plenty of signal available compared to being hid behind a Nipkow disc. However if I want to light the scene beyond a few feet, I suppose I should have minimal noise. Without going for a complete redesign of the preamp, would a NE5532 be a drop-in replacement to a TL072?
What would be the best way to combine the signals from two separate preamps in the same container? It just occurred to me that wiring them in parallel (which is how it is hooked up in one of the prototypes) is probably not the best approach. I have been using dual chips mostly because I already have them, and why not include two sensors for the difficulty of one?