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  1. 10 Automatic Emergency Light Circuit Diagrams Explain

    • An emergency light is a circuit which automatically switches ON a battery operated lamp as soon as the mains AC input is unavailable or during mains power failure and outages. It prevents the user fr… See more

    Automatic Emergency Light Theory

    As the name suggests, it is a system that automatically switches ON a lamp when regular AC supply fails, and switches it OFF when mains power returns. An emergency light can b… See more

    Homemade Circuit Projects
    Using A Single PNP Transistor

    The concept: We know that LEDs require a certain fixed forward voltage dropto become illuminated and it is at this rating when the LED is at it’s best, that is voltages which is around its f… See more

    Homemade Circuit Projects
    Circuit Description

    Coming back to the circuit idea, transistor T1 being an PNP transistortends to remains in switched OFF condition as long as AC mains is present across its base emitter. Actually he… See more

    Homemade Circuit Projects
    PNP BJT Current Flow

    In a PNP transistor we see that current flows from the emitter to the collector when the transistor is in its "on" state. The base current which we call IBplays a crucial role in controllin… See more

    Homemade Circuit Projects
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