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One of the power outage and incoming call alarm circuits
Source: InternetPublisher:赔钱虎 Keywords: Alarm circuit alarm potentiometer power supply Updated: 2020/02/25
The alarm can automatically alarm when the mains power fails or when a call comes in, and the sound can last for 10 to 30
seconds. The alarm time is determined by potentiometers RP and C2.
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