LDR Alarm system

Tuesday, June 16, 2015



Here I made a simple alarm circuit using some common components . It s work on the basis of light.When anyone take the box with alarm system it make buzzer sound. we can integrate it with some other things like traveling bags etc.
You can modifie the circuit by adding thermister. (10k)Then you can use it as fire alarm also

components needed
small box





-10uf capacitor

-100n capacitor

-11k resistor

                                                             Circuit diagram

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