photo sensor control relay


Posted on Feb 4, 2014

A photo or slightly activated relay normally open relay in the closed circuit / contact with the light. In this circuit, a photodiode is used to sense light. The photodiode has a high resistance in the absence of light strikes. The photodiode is connected to the reverse biased state. The only current flowing through it will be due to minority carr


photo sensor control relay
Click here to download the full size of the above Circuit.

iers. When light falls on it, the minority current carriers in the wake of increasing the diode provides a low resistance. Because the voltage across the diode will not be sufficient to bias transistor Q1 and will be reset. Where there is darkness, the resistance increases photodiode and the voltage across it will be enough to move forward bias the transistor Q1 of the relay ON. The diode D2 is used as a diode to protect transistor switching transients produced relay. In this way, the load on the relay contacts can be switched on and off using light strikes the photodiode.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Video Switcher with PIC16F819
    Smartcard controlled Lock with Relay
    Simple continuity tester for pcbs
    Dualxed cmos flasher
    IC L298 based bidirectional H bridge DC motor control circuit
    two servo walking robot using TI launchpad
    tda2822 stereo amplifier circuit
    Electronic 7-Digit Combination Lock
    weather car wont start and radio keyless entry power windows
    Discrete PWM Generator Circuit
    TC621 temperature sensor using poultry hatchery electronic thermostat control circuit diagram



    Top