What is LDR? (Photoresistor) Types, Working, Application, Diagram & Symbol Details
Here are some of the key applications: Light Detection: Due to their sensitivity to light, LDRs are commonly used in light detection circuits, such as burglar alarm systems, light intensity meters, and light-activated switches. Automatic Street Lighting: LDRs play a pivotal role in automated street lighting systems.
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LDR is one kind of resistor whose resistance different depending on the amount of light falling on its surface. When the light falls on the resistor, then the resistance modifies. These resistors are often used in many circuits where it is needed to sense the attendance of light. These resistors have different types of functions and resistance.
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Light Dependent Resistor LDR Symbol In electronic circuits, the LDR symbol is used that mainly depends on the resistor symbol; however, it illustrates the light rays in the arrows form.
المقاومة الضوئية Light Dependent Resistor (LDR)
A Light Dependent Resistor (LDR) is a type of passive electronic sensor used to detect light. It's made up of two conductors separated by an insulator which becomes more conducting when exposed to high levels of light intensity, forming a variable resistor in the circuit.
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Types of LDR Based on Semiconductor Intrinsic LDR Extrinsic LDR Based on Linearity Linear LDR Nonlinear LDR Based on Spectral Characteristics Ultraviolet LDR Infrared LDR Visible Light LDR Characteristics of LDR Photocurrent and Bright Resistance Dark Current and Dark Resistance Max Power Dissipation Maximum Operating Voltage Wavelength Sensitivity
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There are two types of LDRs - intrinsic and extrinsic. Intrinsic LDRs are made of semiconductor materials that exhibit photoconductivity naturally, such as cadmium sulfide (CdS) or lead sulfide (PbS). Extrinsic LDRs are made by doping a semiconductor material with impurities, such as arsenic, to enhance its photoconductivity.
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types of ldr The types of photoresistors can be classified according to photosensitive materials or classified according to their linearity. The most commonly used photosensitive semiconductor glass materials for the manufacture of LDR resistors are thallium sulphide, cadmium sulphide, lead sulphide, and cadmium selenide.
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LDR, which refers to Light Dependent Resistor, helps in controlling loads of the circuit based on light intensity. LDR also serves as a photoresistor device that comprises semiconductor material of high resistance.
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1. Working Principle 2. Construction 3. Circuit 4. Characteristics II.Types III.Applications I.Features Working Principle Photoconductivity, which is nothing but an optical illusion, is the operating theory of the LDR. If the substance absorbs light, so the material's conductivity decreases.
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An LDR or light dependent resistor is also known as photo resistor, photocell, photoconductor. It is a one type of resistor whose resistance varies depending on the amount of light falling on its surface. When the light falls on the resistor, then the resistance changes.
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LDRs are mainly seen in alarm clocks, street lights, light intensity meters, burglar alarm circuits, light beam alarms, reflective smoke alarms, outdoor clocks, and camera light meters. However, photoresistors are often used in electronic circuit designs where it is important to detect the presence of a level of light. Symbol
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A Light-Dependent Resistor (LDR), (also known as a photoresistor, photocell, light-dependent resistor, or photo-conductive cell), is a light-sensitive resistor or a light-sensitive sensor used in electronic circuit designs for the purpose of detecting the presence or intensity of light.
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There are two types of Light-dependent resistors as shown in the following: Intrinsic LDR Extrinsic LDR (1). Intrinsic LDR: This type of photoconductive cell or LDR is made of pure semiconductor material like Silicon or Germanium. There is no doping with the impurities.
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Design considerations Three photoresistors with scale in mm Large CdS Photocell from a street light. A photoresistor is less light-sensitive than a photodiode or a phototransistor. The latter two components are true semiconductor devices, while a photoresistor is a passive component that does not have a PN-junction.
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16471 - Advertisement - LDR (Light Dependent Resistor) as the name states is a special type of resistor that works on the photoconductivity principle means that resistance changes according to the intensity of light. Its resistance decreases with an increase in the intensity of light.
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The Type of LDR. There are two types of LDR. These are the intrinsic photoresistor and the extrinsic photoresistor. Notably, the two photoresistors are different because the intrinsic photoresistor has pure semiconductor materials. At the same time, the extrinsic photoresistor uses semiconductor materials that have undergone doping and contain.