A photoresistor is made of a high resistance semiconductor. In the dark, a photoresistor can have a resistance as high as several megohms (MΩ), while in the light, a photoresistor can have a resistance as low as a few hundred ohms. If incident light on a photoresistor exceeds a certain frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band.
Photoresistors can be placed in streetlights to control when the light is on. Ambient light falling on the photoresistor causes the streetlight to turn off. Thus energy is saved by ensuring the light is only on during hours of darkness.
Standard Type and Specifications
|Specification||Type||Maximum Voltage||Maximum power||Spectrumpeak value||Light resistance(10Lux)(KΩ)||Dark resistance(MΩ)||Response time(ms)|
|φ12 series||GL12516||250||200||560||5- 10||1||30||30|
They are also used in some dynamic compressors together with a small incandescent or neon lamp, or light-emitting diode to control gain reduction. A common usage of this application can be found in many guitar amplifiers that incorporate an onboard tremolo effect, as the oscillating light patterns control the level of signal running through the amp circuit.
1. What is the size for LDR?
φ3 series, φ4 series, φ5 series, φ7 series, φ10 series, φ12 series, φ20 series.
2. What is your production capitable?
5 million Pieces per Month
3. Packaging information.
100pcs per small package,1000pcs per big package
Light dependent resistors, LDRs or photoresistors are often used in circuits where it is necessary to detect the presence or the level of light. They can be described by a variety of names from light dependent resistor, LDR, photoresistor, or even photo cell, photocell or photoconductor.View More
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