Hi Chris,

I put your messages and schematic for the differential photo detector on the
web here:

http://jjlahr.com/science/psn/chapman/photo_detect/

Let me know if that's OK with you and if there are any changes that I
should make.  I left it as a series of E-mail exchanges, and your
schematic is there in gif and pdf formats.

Cheers,
John

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