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56794quick question

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  • xavier1134
    Oct 1 2:29 PM
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      honestly, I'm not too familiar with the mechanism with which
      reverse-biased infrared emitters/phototransistors work, particularly
      in reference to photopoppers. I've got a bunch of LDR's (1M dark, 300k
      light) - can I use them instead, or do I have to go get some IR LED's?

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