- PE-B1: LED on/off Circuit
- PE-B11: DC Motor Speed Control Circuit
- PE-B13: Automatic Street Light Control Circuit
In this circuit during evening the LED (street light) glows and in morning the LED (street light) become automatically OFF.
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Details of material required
About Components
- Resistor: It protects the LED from burning.
- Transistor: It has 3 terminals – collector, base and emitter. The emitter is shown with arrow in the symbol.
- LDR: It is light sensitive device. When light falls on it, its resistance decreases. When it is in dark its resistance is maximum.
- Capacitor: It stores electric energy of battery for some time. It is called temporary storage device.
Circuit diagram & Working
When light falls on LDR, the street light i.e. white LED is OFF. When the LDR is in dark, the streetlight i.e. the white LED becomes ON.
Connection Diagram
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