Are you worried about unexpected power outages damaging your equipment? This power outage alarm kit can help. It is easy to assemble and features both an alarm circuit and a city power monitoring circuit. The LED on the board indicates the presence of power, while the alarm circuit produces a loud alarm signal when the city power is lost. With this kit, you can protect your valuable equipment from damage caused by sudden power outages.
This power outage alarm kit includes an alarm circuit and a city power monitoring circuit. The city power is rectified and limited by R5, and then supplied to the monitoring circuit. The LED on the board indicates the presence of power. The optocoupler N provides a primary current, making the output end conductive. U2's 5th input is a low level input, and its 7th output is also a low level. When city power is lost, N is turned off. At this point, U2's 5th input receives power supply voltage, which becomes a high level. Its output end outputs a high level, triggering VT2 to power the alarm circuit and produce an audible alarm signal.
Working Voltage of the product: 3V
Detection voltage of the product: AC110V~220V
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