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Increasing-volume Close-the-door Reminder Circuit

2014-11-14 04:38  
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Increasing-volume Close-the-door Reminder Circuit
As shown in the figure is an increasing-volume close-the-door reminder circuit. It is used in confidential rooms of banks or other organizations to remind people to shut the door when in and out. When the door remains unclosed for 10s after it is opened, it will give a reminder every two seconds Please close the door with increasing-volume of sound, it will not stop until it is closed.