This is a closeup shot of the sensor. The E side corresponds to the emitter
and is basically an infrared LED. The S side corresponds to the sensor and
is a phototransistor. Optimal distance is about 0.150" from the sensor to
the refletive surface.
I bought mine from
The Mark III Store
but you can also get them from Digi-Key
or Mouser.
Bigger...
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