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   sci.electronics.basics      Elementary questions about electronics      72,318 messages   

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   Message 71,138 of 72,318   
   AK to amdx   
   Re: Resistance Light and Dark Values   
   15 May 19 10:51:31   
   
   From: scientist77017@gmail.com   
      
   On Wednesday, May 15, 2019 at 9:59:26 AM UTC-5, amdx wrote:   
   > On 5/15/2019 9:46 AM, AK wrote:   
   > > 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.   
   > >>   
   > >>   
   > >>   
   > >>   
   > >>   
   > >> --    
   > >> This message may be freely reproduced without limit or charge only via   
   > >> the Usenet protocol. Reproduction in whole or part through other   
   > >> protocols, whether for profit or not, is conditional upon a charge of   
   > >> GBP10.00 per reproduction. Publication in this manner via non-Usenet   
   > >> protocols constitutes acceptance of this condition.   
   > >    
   > > Does anyone know of an alarm circuit that they have made and works?   
   > >    
   > > I have tried 2 different circuits and both have failed.   
   > >    
   > > Andy   
   > >    
   >    
   >   Please put the resistance meter on your LDR and give use the resistance   
   > Dark and then with laser light on it.   
   >   You will need to change the scale between the two measurements.   
   >                                           Mikek   
      
   In the dark, .83 on the 2M scale.   
      
   With laser, .3 on 2k scale. From a distance of 6 feet.   
      
   So, 830,000 and 300 ohms.   
      
   Andy   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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