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Light-controlled anti-theft alarm circuit using photosensitive diode b
Source: InternetPublisher:3228 Keywords: Photodiode light control anti-theft alarm circuit BSP Updated: 2020/12/31
Using light to control the alarm has high sensitivity and reliable operation, and can be used for alarms such as safes.
The circuit is shown in the figure. It uses photosensitive diode LD as the detection element. Figure 13-153 (a)
shows the alarm when the light decreases, and the picture shows the alarm when the light increases.
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