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Text File  |  1999-10-21  |  74b  |  13 lines
  1. An optoisolator 
  2.  
  3. A photodetector
  4.  
  5. A Hall-effect transistor
  6.  
  7. An LED
  8.  
  9.  
  10.  
  11. 3
  12.  
  13.