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Description:
This circuit is used to detect ambient light, when the light is brighter, a sound and light alarm is sent out. Its power supply voltage is DC 3V to 5V.

Working Principle:
    W1 is adjustable resistance to regulate induction sensitivity, and GMDZ is a photosensitive resistance.
       When the light is brighter, the resistance value of the resistance is reduced. The base current flowing into the Q1 is larger.
       The voltage of the triode collector is reduced by D1 and the R2 is the current limiting resistor.
    At the same time, the base current flowing through the R1 into the Q2 is also larger. Q2 enters the state of saturation. SP1 is a buzzer and she starts to call the alarm.

Component List:

Diagram:

Finished Product:

Tested by ICStation's Outstanding Partner bzoli5706:

Learn More Details in the Video:
(The language in the video is English)