light activated led


Posted on Feb 6, 2014

A simple and interesting project of a light activated LED circuit, which will light up an LED when receives light. The circuit is very easy to build and using only six components. The photoresistor is performing the light sensing task. The transistor 2N2222 is working as a switch in this circuit. When any type of light like sunlight, bulb or lamp


light activated led
Click here to download the full size of the above Circuit.

light will fall on the surface of photoresistor it will switch on the transistor and the LED will lightup. The 50K variable resistor (VR) is used to adjust the amount of light on which you want to lightup the LED. The 1K resistor is used to protect the photoresistor from direct connecting to the supply when the variable resistor is on zero and 330 ohms resistor is used for providing the required current to the LED. The circuit can be operated with four 1. 5V batteries of any size.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Analog Clock And Temperature sensor On An Oscilloscope using Arduino
    ME218A: Soccer Pinball actuators
    Numerical control UPS uninterrupted power system technological principle and typical application
    lowvoltage ac voltmeter
    digital counter circuit
    PBL3717A motor stepper driver circuit design electronic project
    Direct Conversion AM Radio
    Toggle Switch No.1 - Cmos 4013
    High and low frequency signal generator circuit diagram



    Top