Schematics stun fish repellent RATS MOSQUITO RANGE AND COCKROACH AUTO LAMP CIRCUIT SCHEME automatic

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Garden lights are usually used to light up the park home owners google voie at night, so the garden will still look beautiful and bright even though it was dark, and then what to do with this article, well ... in this article we will try to make a series google voie of automatic garden light, its function The lights will automatically turn on when it gets dark, so homeowners need not bother to turn on the lights because the lights rangkainai it will turn on and off automatically according to the intensity of the light it receives. Tools and materials Batrai 9 volt DC 1k ohm Variable resistor LDR (light sensor) Relay Transistor 2N2222A NPN Working Principle circuit
This circuit uses the principle of a voltage divider, google voie so when the LDR receives light / daylight condition (light resistance of LDR when getting close to 400 Ohm resistance when it does not receive its light close to 1 Mega Ohm), the LDR resistance is smaller than the resistance google voie of variable resistor so that there is no condition of the transistor cut -off and the relay is off so that the lights will die, but when the LDR does not receive light / night conditions LDR resistance google voie greater than the resistance google voie of the variable resistor so that the transistors in saturation state / active and active google voie relay so the lights will live.