Doubt about laser power in laser transmitter

AI Thread Summary
When designing a laser torch audio transmitter and receiver, the minimum power of the laser is influenced by the distance it needs to cover, ranging from a few inches to several miles. For short distances, like half an inch, minimal power is sufficient, while longer ranges, such as 100 meters, require more power to ensure detection. A laser diode that is visibly bright can typically be detected by a phototransistor like the 2N5777 at significant distances under good conditions. Understanding link budgets is crucial for calculating the necessary power and ensuring effective communication. Proper planning and knowledge of these factors will enhance the performance of the laser transmitter and receiver setup.
NOMI_2009
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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
 
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How far are you shooting this laser? .5 inch? a foot? a hundred yards? 20 miles? This will affect your required strength
 
range is about .5 inch
 
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!
 

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