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Sunday, 5 April 2015

How To Make An LDR (light-dependent resistor ) Circuit


In this Tutorial i will show you that how to Make LDR circuit so it,s an easy DIY project 
Components you needed :
DC 5V source ( use old Cellphone Charger )
Battery 3.5v Dc ( Like Mobile Phone Battery )
Two Transistors BC547 
LDR
Resistors 33k,1k,100 ohm
One Diode 1n4007
One switch Button for On off 
Led,s Red + Three White Led Connect 100 or 470 ohm Resistor with Every led 
When Light Falls on LDR the Resistance of LDR start Decreasing and its low resistance make the Transistor 1 in to Conduction mode and Cut off the Second transistor but when no Light falling on LDR so it,s Resistance start increasing so transistor 1 stop conducting and now we all knows that current always chose the path where Resistance low so it turn on the second transistor Because the 1k ohm resistor is low resistance so thats why transitor 2 start conduction and Led,s Start glowing;


Watch Video 

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