Tuesday, 27 January 2015

digital logic - Automatic switch using LDR


enter image description here


I've implemented above circuit and it was successful. The given circuit needs 12VDC to run properly.


I want to run this circuit on 5-6VDC or 9VDC whichever is possible. I know I have to change resistors but not confirmed which to use.


Also if I use 9V battery only to activate 6V relay for 8hrs daily, for how many days will that battery work?




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