Hello friends, I am telling you in this article, what is LDR?, The use of LDR, LDR’s profit, LDR’s use. So let’s start
what is LDR?
When there is light energy e = HV on the surface of a parent under, and if its energy is more than the Forbidden ENERGY GAP between the valence band and the conduction band of the seminary, then electrons go fast in the Valence Band from the conduction band. Where electrons and hole pairs increase the conductivity of the material, which depends on the intensity of light (intensity). When the intensity of light is increased, then the resistance of the material is reduced and the conductivity increases, so this device is called LDR “Light Dependent Resistor”.
construction of LDR
The construction and circuit symbol of LDR has been shown. LDR is made of a thin strip of a light-sensitive material, which consists of two terminals. This LIGHT-SENSITIVE Material (CDS) is deposited in a Zig-Zag shape on a Ceramic Base, which increases the area of CDS, which can be controlled to its resistance. This light-sensitive material (CDS) is levied metal contact by external lead at both ends.
Now, this whole structure is seal in the enclosure of a plastic, which is a plastic transparent window on which there is light in the structure.
Characteristics of LDR
Characteristics of LDR have been shown to Curve. It is between curve resistance and the intensity of light (Intensity of Light). It has been reported that when the intensity of light is very low, then the resistance of LDR is very high, such as increasing the intensity of light, the resistance of LDR decreases.
Benefits of LDR
LDR can be operated on low voltage.
Loss of LDR
IC is not suitable for the application.
Use of LDR
1.Light in detection
2.Light moving switch
3.Sound re-production in films
4.In reading the computer tape card, etc.
- Read more:: what is filter circuit?
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