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Superb Instructable!I connect f.o. for a living, and would like to add some thoughts....Fiest....preventing some mistake that could lead anybody to "take a look" on a really "laser connected" f.o.,Second, I will do this with blinking the LEDs (a 555 IC could do the trick) and, for added security I would use blue LEDs.....So, I used your device in some 30 ft MM cables and works really good, but, in fear of "live" lasers, I never looked directly to the fibers. I put a semitranslucent paper on te "output connector" to see the red glow through the paper.It works fine, adds security.And Its cost was 0$ !!
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