Quad diode position sensor (work in progress)

I am trying to build a circuit to read a quad diode position sensor. The inputs are on the left. The first stage amplifies the photo diode signals. The second stage compares the quadrants and the third stage sums the outputs to give an X Y signal. Any thoughts on which Op amp would be best to give low noise and high sensitivity.

by shawt
March 03, 2012

The circuit is based on the description in this link-> http://www2.bioch.ox.ac.uk/~oubsu/ebjknight/q4d.html

by shawt
March 03, 2012

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