Wednesday, March 27, 2013

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Morning Alarm Circuit Diagram Using LDR





Description

          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

                Buzzer




Source by : http://www.electronics-circuits.in/2012/01/morning-alarm.html



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