The power-off alarm circuit of passive type

Published:2011/6/29 6:45:00 Author:Seven | Keyword: power-off, alarm circuit, passive type | From:SeekIC

The power-off alarm of passive type doesn't mean it doesn't need a working power supply, but is makes use of the electricity in the capacitor, which allows the alarm to work for some time and complete the power-off informing task, the circuit is shown in the figure.



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