Photosensitive Alarm Photosensitive DIY Electronic Production Parts Photosensitive Sound Llight Alarm KitItem NO.: MingAn DIY
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- Product Name: Photosensitive Alarm Photosensitive DIY Electronic Production Parts Photosensitive Sound Llight Alarm Kit
- Item NO.: MingAn DIY
- Weight: 0.1 kg = 0.2205 lb = 3.5274 oz
- Category: Electronic Modules > Development Board
- Tag: Photosensitive Alarm , Photosensitive , DIY Electronic Production Parts , Photosensitive Sound Llight Alarm Kit
- Creation Time: 2024-05-05
Photosensitive DIY Kit
Product Information:
This circuit is used to detect the ambient light and give an audible and visual alarm when the light is bright.
W1 is an adjustable resistor used to adjust the sensing sensitivity. GMDZ is a photosensitive resistor. When the light is bright, the resistance value of the photosensitive resistor decreases, the base current flowing into Q1 is large, the voltage of the triode collector decreases, D1 is lit, R2 is a current-limiting resistor, and the base current flowing into Q2 through R1 is also large, Q2 enters the saturation state. SP1 is the buzzer that starts to sound the alarm after it is powered on
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