Showing posts with label morning. Show all posts
Showing posts with label morning. Show all posts
Saturday, September 13, 2014
Morning Alarm Wiring diagram Schematic 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
Buzzer
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