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Showing posts with label ldr. Show all posts

Friday, November 7, 2014

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.
Component Required Resistor 4.7k preset , LDR

Wednesday, September 3, 2014

Dark Sensitive Power Switch Wiring diagram Schematic Using LDR

Description

Circuit showing a Dark Sensitive Power Switch .Here we have used a ldr and a ordinary transistor for making this schema

.Connect any 230 volt equipment at the load .You need a 9 volt power supply
Components Required

Resistor

10 k , 680 R

Transistor

BC 548

Diode

IN 4007

Relay

LDR