> Is it possible to remove an optical reader from a projector and make it run 
> independently?

Theoretically, yes, but it would be quite difficult. The device would need to 
contain the exciter lamp, the optical pick up, a film path with rollers between 
the two, the power supply for the exciter lamp, and at a minimun the preamp 
section following the audio pick-up. Extracting all this from a projector and 
building it into some custom case would be quite a job. It might be easier to 
start with a projector that's relatively easy to open-up — a Singer/Telex 
slot-load for example, disable the functions you DON'T want — e.g. if you don't 
want projector noise, disconnect the motor; if you don't want a light beam, 
remove the lamp, etc) then devise a threading path so the synchronizer can pull 
through the loop through the optical reader section on the projector. (You 
might also have to remove a drive sprocket or two).

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