Chapter 2The associated document. To make a science project category Auto dark sensor system invention origin project to consult documents from the Web site. Any of the following:2.1 knowledge about Transistor and Diode, LDR, resistor. 2.1.1 l Dr (LDR: Light Dependent Resistor). LDR is the sensitive type, resistance, light resistance, that is, the economic ability to take power when the light come fall, impact. Sometimes referred to as four grown recycling c. Manchester (Photo Resistor) or four grown con dak (Photo Conductor) is the resistance from semiconductor (Semiconductor) type cat o ดเมี่ sulfide (CdS: Cadmium Sulfide) or silicone o ดเมี่ nai (Cadmium Selenide CdSe:), which is the substance of this Demi leaders. It was a ceramic that is used as a base plate and stand out from the plaster.
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