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Feb 6th, 2016
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  1. Vs = 5V
  2. I = 300mA
  3. Vdrop of each led = 1.3V
  4. so R = 5v - 2.6v / 0.300A.
  5.  
  6. Vb = 3.3V
  7. Vc = 0V
  8. Ve = 0
  9. Ve < Vb > Vc => Sat.
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