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The brightness of the surrounding light controls the function of this circuit. The light sensor used in this circuit is a light dependent resistor(LDR). This LDR is connected to the non-inverting input of the 741 opamp IC. Once the intensity of the light....
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Light Switch. This is a light switch or light activated relay circuit.The relay if LDR uncoverd and relays, if LDR VR1 covered. Adjust sensitive.LED for...
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This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of....
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LDR( Light dependent resistor ) Engineering is a technique of making several electronics circuits following thelogic of a simple light and dark sensor using transistors, 555 IC and 741 IC. Out of several optical sensors, light dependent resistor can beused....
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Remote tester circuit also resembles the logic of a dark sensor (using BC557) . LDR has been replaced with IR sensor TSOP 1738. The circuit works as a remote tester. Pressing a remote control switch near the IR sensor, switches on the LED D2. I am Sagar....
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This musical light alarm circuit is very simple, uses only 7 components, a LDR and a 3. 6 V battery or 3 x 1. 2 volts rechargeable batteries. The well-known UM66 is used as the sound generator and will give a pleasent wake up alarm. As you probably know the....
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A simple light activated switch circuit with diagram and schematic using IC LM 311-wired as a voltage comparator and an LDR that acts as light sensor...
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Automatic Dipper for Vehicles using timer IC NE555 and LDR use to dip the light of vehicles circuit diagram with description various automobile project...
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Electronics Tutorial about Light Sensor including Photocells, LDR, Photodiodes, Phototransistors, Photovoltaic Cells and Light Dependent Resistor....
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This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it is a modern substitute for the old sandglass. Useful also for....
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This sunlight-controlled lamp uses a light-dependent resistor (LDR) as the sunlight sensor and a total of 25 high-brightness white LEDs. Separate resistors are connected in series with each row of the LEDs. The working of the circuit is very simple. During....
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The following circuit shows about Automatic Room Power Control Circuit Diagram. This circuit based on the NE555 IC. Features: uses two LDRs, use ....
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A light/dark sensing circuit is extremely useful and versatile in a wide range of renewable energy projects from automatic lighting to security systems. In our article Light Dependent Resistor we explained how an LDR can be used in simple circuits to control....
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When loading a battery during the day from a solar panel it can be partially discharging through the panel after nightfall. This solar panel power switch circuit replaces the diode and connects the panel to battery through a relay contact. When the voltage....
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Here is a simple fire alarm circuit based on a Light Dependent Resistor (LDR) and lamp pair for sensing the fire. The alarm works by sensing the smoke produced during fire. The circuit produces an audible alarm when the fire breaks out with smoke. When there....
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The following circuit shows about A Simple and Cheap Dark-Detecting LED Circuit. Features: Photoresistors are reliable, photocell or LDR, LED ....
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Hi guys..!!this is my 1st easy cheap n simple instructabel u need following components for laser burglar alarm-1. LDR or photocell 2.printed circui....
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This Outdoor LED Solar Garden Lights project is a hobby circuit of an automatic garden light using a LDR and 6V/5W solar panel. During day time, the internal rechargeable 6 Volt SLA battery receives charging current from the connected solar panel through....
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Light sensitive switch or dark sensitive switch is a special type of switch using op-amp IC LM74 and LDR circuit diagram with description ...
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A solar powered Flasher to scare away the nocturnal animals like bats and cats from the farm yard or premises of the house. The brilliant multicolored flashes confuse these animals and they avoid the hostile situation. It is fully automatic, turns on in the....
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This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it`s a modern substitute for the old sandglass. Useful also for....
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Circuit of a compact and true solid-state automatic lawn light is described here. The circuit can be used to switch on incandescent garden light bulbs at...
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Adjust value of R1 to get good performance of sensor LDR, if in your practice with 2. 2 M ohm still turn on the lamp you can add value of R1 with the large of 2. 2 M ohm. R1 and R2 is used as voltage divider. R2 is LDR that resistance will change when LDR in....
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Color sensor is an interesting project for hobbyists. The circuit can sense eight colors, i. e. blue, green and red (primary colors); magenta, yellow and cyan (secondary colors); and black and white. The circuit is based on the fundamentals of optics and....
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This circuit can be used as a small beacon or marker light, amd toys or novelty items. R1 is an LDR that has‰¥10 k © dark-resistance, or a CDS photocell. C1 determines the flash rate. ..
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Here is the circuit diagram of an ultra sensitive intruder alarm. The shadow of an intruder passing few meters nearby the circuit is enough to trigger the alarm. Here IC2 uA 741 is wired as a sensitive comparator, whose set point is set by R6 &R7. The....
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This simple circuit switches on a light around 2 hours after midnight, the time at which most of the robberies taking place. This simple circuit is build around a CMOS IC 4060 to obtain the required timing. During day time the LDR has low resistance and....
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This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of....
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Here is another fun project for children as well as electronics beginners. We often hear the sound of grasshopper or cockroach (i. e. shrill sound) at night. The project published in this website Electronics grasshopper produced PI-PI sound (sound like....
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When there is no smoke the light from the bulb will be directly falling on the LDR. The LDR resistance will be low and so the voltage across it (below. 6V). The transistor will be OFF and nothing happens. When there is sufficient smoke to mask the light from....