LRD circuit

Discussion in 'General Electronics Chat' started by rdolloh, Nov 7, 2012.

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  1. rdolloh

    Thread Starter New Member

    Nov 7, 2012
    I'm trying to make a simple circuit with an LDR, but it seems not to work properly. My setup is pretty simple; Battery 9V (or 4x9v=36V) LDR; not sure which one, have them in 3 different sizes, very small, 1/4inch in diameter and the biggest one is around 3/5inch in diameter. Light bulb, different sizes and shapes and watts. When the light is off I get a reading of 0V, and when the light goes on I get the reading of 4V+-, but my light bulb doesn't turn on, and without the LDR it does. The same reading counts for different LDR's in different sizes. Also I have tried 36V battery, which gives me the same reading of 4V+- with the LDR is connected. Any suggestions? I am kinda new to electronics, so a long way to go for me still :)
  2. Wendy


    Mar 24, 2008
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