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'Distance Measurement ---- 4 Quadrant Diode'
1997\10\24@134225 by Ram Krishnan

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For those looking for 4-Quadrant photodiodes that would probably be useful
with the rangefinder, you can find them in most CD-ROM players. Sharp
Electronics makes
a few

2 element       PD322PI
6 element       PD663/PD666PS   (2 large outer, 2 X 2  smaller matrix).

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