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Bt136 is a triac that is used to control the.
Automatic night lamp circuit diagram using ldr and triac. A simple automatic mast light circuit using an ldr triac and a diac can be see in the above drawing. The circuit is using an ldr as a dark sensor when the circuit will be in dark then resistance of the ldr increases due to which the transistor will conduct and turn on the bt136 triac. The projects automatic night lamp circuit is a very simple and build around four major components i e.
Therefore the voltage increasing at gate of triac bt136. That by the way is not a mechanical switch rather an scr or triac. Photoelectric relay cell interconnection of a.
The lamp used in this project is porch light which would turn on automatically in dark night time and turn off in light day time. After triac triggered it turns on and passes the power supply between. If low light the resistance is high as a result less current flow.
In the day time due to light the resistance of ldr will be very low. The working of this circuit is pretty simple and the critical switching job is handled by the diac db 3. Triac is a three terminal electronic component that is also known as a bidirectional triode thyristor.
Https youtu be 6tunaau504 follow us on. It is a type of resistor whose resistance value changes according to the intensity of incident light transmitted to it. Automatic 220v night lamp circuit using ldr and triac instruction.
So the voltage drop be high. Triac scr ldr and resistor. This keeps the triac bt136 on off stage.
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