Wednesday, April 10, 2013

Morning Alarm Circuit Diagram Using LDR


          Circuit showing a morning alarm.Here we have used a switching transistor.When the sun rise up ldr is low resistance so the ldr is conduct and a positive volt coming to the base of the Q1 there for the transistor will switch.This time  the buzzer is ON . Adjust the preset control the intensity of light.Manually cut off the power.Are you interested please comment and join this site

Component Required

                Resistor  4.7k preset  , LDR

                Transistor   BC 548


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