From: look165@numericable.fr   
      
   A LDR reacts in some ms when the light's  wavelength is in the operating   
   range.   
      
   Phil Hobbs a écrit le 15/05/2019 à 07:49 :   
   > On 5/15/19 12:37 AM, Wolf Bagger wrote:   
   >> On 2019-05-14 05:25, AK wrote:   
   >>>   
   >>> Maybe I need an LDR that responds to light quicker.   
   >>>   
   >>   
   >> They're not slow. Do you have a meter to measure the resistance while   
   >> you illuminate it with your laser? It may not be interested in that   
   >> wavelength of light.   
   >>   
   >   
   > Yeah, they're slow.  Not seconds, but dramatically slower and less   
   > well-behaved than photodiodes or even phototransistors.   
   >   
   > Using a CdS or CdSe cell is very rarely the right answer.  If you   
   > modulate the light source and detect the AC at the other end with a   
   > photodiode, transimpedance amp, and synchronous detector, you can   
   > easily make an 'electric eye' that works fine in direct sunlight.   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
      
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