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Photosensitive Sound and Light Alarm Kit Electronic Production Parts DIY Handmade
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Photosensitive Sound and Light Alarm Kit Electronic Production Parts DIY Handmade

- China

0 Customer Reviews | Please refer to English description
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Main Features


Function introduction: This circuit is used to detect ambient light, and sound and light alarm when the light is bright

Supply voltage: DC 3V to 5V

Principle description:

W1 is an adjustable resistor used to adjust the sensing sensitivity. GMDZ is a photoresistor. When the light is brighter, the resistance of the photoresistor decreases. The base current flowing into Q1 is larger. The voltage of the collector of the transistor decreases. D1 is lit and R2 is limited. Current resistance. At the same time, the base current flowing into Q2 through R1 is also large. Q2 goes into saturation. SP1 is a buzzer. She also started to sound an alarm after receiving power.


This product requires self-made welding. (Easy to make, no manual support)

Package includes:

1 x Kit


Voltage Regulator
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