If there is some chattering in the relay, that may be because off the difference between the turning on and turning off voltages. This circuit is nothing great, but some simple basics. Nothing to care about some trial and error you will get the correct setpoint of R1 where the circuit works. If not, make further adjustments with R1. Now cover the top of LDR using a black paper and see the relay gets activated. If not reduce the voltage across LDR further more by adjusting R1 to make relay off. Ensure that relay is off in this condition. To set up the circuit switch on the power supply, connect a multimeter across LDR and adjust R1 so that voltage across LDR is just below 1/3 supply voltage. Notes.Īssemble the circuit on a good quality PCB or common board. The result we get a relay that operates according to the intensity of light falling on the LDR. This makes the output of IC go high making the relay energized. When light falls the voltage across LDR rises above 2/3 Vcc. Transistor Q2’s base is connected to the collector of Q1.So Q2 will be off keeping the relay de-energized. The resistor R1 is adjusted in such a way that under normal condition the voltage across the LDR is less than 1/3 the supply voltage. The circuit is based on a NE 555 and two transistors for driving the relay. This is a simple photo switch suitable for home and industrial purposes.The circuit switches on a relay when the light intensity falling on the sensor crosses the set limit. The output is actuated using the relay mechanism. Switching is handled using 555 IC and the two transistors. The light intensity is sensed using an LDR and the desired intensity can be set by adjusting the potentiometer. This circuit is very simple and easy to make. If you’re new to 555 IC, you may begin reading more about 555 in our article – 555 IC The Basics. The heart of this circuit is the very popular NE/SE 555 IC – which is a timer IC almost everyone is familiar with. We’ve designed this photo switch circuit using simple & popular components. The switch will turn ON/OFF based on light intensity. If you’re not familiar with the term ‘photo switch’ – this is nothing but a light-activated switch. Trust this transformer for reliable lighting performance.In this project, We’re building a Photo Switch Circuit using 555 IC. Versatile for outdoor uplights, string lights, garden decor, porch lights, and water features. 【Wide Application】This 200W transformer converts 120V AC to 12V/14V AC, ensuring safety for compatible LED and halogen landscape lighting. Trust this transformer for reliable outdoor lighting customization. It has a memory function and built-in hanging holes for direct mounting on outside walls. 【Easy to Use & Memory Function】The 200W low voltage transformer is easy to set up with MENU, ▲▼, and ENTER keys. The transformer is ETL listed for quality and safety assurance, providing a reliable solution for all your outdoor lighting needs. It is suitable for both indoor and outdoor use, and features a manual reset circuit breaker that automatically trips when overloaded, ensuring safety and protection. 【Weatherproof & Safe 】This 200W low voltage transformer is made of high-quality metal material, designed to resist rain, snow, dust, and corrosion. With its sleek and user-friendly design, this transformer is a practical solution for all your outdoor lighting needs. This feature allows you to customize your lighting system and maximize energy savings. 【5 Timing Modes】The 200W Low Voltage Transformer is designed with 5 modes, including Manual ON/OFF, AUTO ON/OFF, Photocell ON/timer OFF, timer ON/OFF, and TEST, making it easy to operate with a push of a button. This transformer is compatible with all 12V/14V low voltage LED and halogen landscape lighting. It features a detachable photocell sensor and 6ft power cord, making it easy to install both indoors and outdoors. 【Dusk to Dawn Sensor】 The 200W Low Voltage Transformer is a convenient and reliable solution for all your outdoor lighting needs. Please refer to this following cable slection chart, it will help you with it. What Cable and How Long should I use to connect with transformer? Then you can choose the transformer higher than 113W(=91W/0.8). 1.Calculate the total wattage of your light fixtures in your plan.Ģ.Choose the transformer that is large enough to support the total wattage you need.ģ.The transformer wattage load (total watts needed for your fixtures) should be within 80% of the rated capacity of the transformer.įor example: if you have 7 pack 13W landscape lights, so the total wattage is 91W.
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