Looking for help identifying a photo sesnsor

Thread Starter

kbirecki

Joined Oct 22, 2009
20
I am looking for help identifying the attached photo sensor. It came from a lawn light and is supposed to turn the light on at dusk. It runs on a 1.2V rechargeable battery. I have many of them and they are corroded and I want to replace them. I'm trying to find the right part that I can order from DigiKey or Mouser. Any assistance to point me in the right direction would be appreciated.
Thanks!
 

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BMorse

Joined Sep 26, 2009
2,675
those are CDS photocells, unfortunately, unless you can read the value of that one with a multimeter, you may not find the exact value for replacement, if you can unsolder that one and take resistance readings from it in complete darkness and exposed to the brightest light source, then you may be able to narrow it down to a specific one....
 

#12

Joined Nov 30, 2010
18,182
Kinda looks like a Cadmium Sulphide photo cell. They are available in several resistance ranges. Not my specialty, but you can measure a good one in daylight and darkness, then search datasheets like this one. Somebody that has been playing with those lately will be along in a moment.
 

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Thread Starter

kbirecki

Joined Oct 22, 2009
20
Aha! I do have at least one that is still looking decent, so if I can get two good resistance values (light and dark), I should be in the right direction.
THanks!
 
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