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Doubt about laser power in laser transmitter

  1. Apr 3, 2010 #1
    I'm making a laser torch based audio transmitter n receiver using 2n5777 phototransistor as receiver what must be the min power of the torch
  2. jcsd
  3. Apr 3, 2010 #2
    How far are you shooting this laser? .5 inch? a foot? a hundred yards? 20 miles? This will affect your required strength
  4. Apr 6, 2010 #3
    range is about .5 inch
  5. Apr 7, 2010 #4
    If you are running a laser diode with enough current so you can see it yourself, you will should be able to detect it with almost any photodiode 100 meters away in decent conditions, easy!
  6. Apr 7, 2010 #5
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