From: scientist77017@gmail.com   
      
   On Wednesday, May 15, 2019 at 9:30:43 AM UTC-5, Cursitor Doom wrote:   
   > On Wed, 15 May 2019 11:15:18 +0200, Look165 wrote:   
   >    
   > > A LDR reacts in some ms when the light's  wavelength is in the operating   
   > > range.   
   >    
   > You really can't beat a photodiode, though.   
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   > --    
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   Does anyone know of an alarm circuit that they have made and works?   
      
   I have tried 2 different circuits and both have failed.   
      
   Andy   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)