26-03-2014, 03:30 PM
Light Dependent Resistor - LDR
[attachment=60487]
INTRODUCTION
Two cadmium sulphide(cds) photoconductive cells with spectral responses
similar to that of the human eye. The cell resistance falls with increasing light
intensity. Applications include smoke detection, automatic lighting control,
batch counting and burglar alarm systems.
Applications
Photoconductive cells are used in many different types of circuits and
applications.
Analog Applications
• Camera Exposure Control
• Auto Slide Focus - dual cell
• Photocopy Machines - density of toner
• Colorimetric Test Equipment
• Densitometer
• Electronic Scales - dual cell
• Automatic Gain Control – modulated light
source
• Automated Rear View Mirror
[attachment=60487]
INTRODUCTION
Two cadmium sulphide(cds) photoconductive cells with spectral responses
similar to that of the human eye. The cell resistance falls with increasing light
intensity. Applications include smoke detection, automatic lighting control,
batch counting and burglar alarm systems.
Applications
Photoconductive cells are used in many different types of circuits and
applications.
Analog Applications
• Camera Exposure Control
• Auto Slide Focus - dual cell
• Photocopy Machines - density of toner
• Colorimetric Test Equipment
• Densitometer
• Electronic Scales - dual cell
• Automatic Gain Control – modulated light
source
• Automated Rear View Mirror