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this circuit will make a alarm when the light falls on the ldr
you need- 1] resistors 100k ohm , 56k ohm , 10k ohm 2] transistors 1 pnp and 1 npn 3] capacitor 0.04 uf 4] ldr 5] 8 ohm ...
A photoresistor, light dependent resistor (LDR) or cadmium sulfide (CdS) cell is a resistor whose resistance decreases with increasing incident light intensity. It can also be referred to ...
solder according to the digram.
you can put the circuit in a box when you open the box in a well lit room the alarm goes off!!
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