The general alarm circuit with time delay function

Published:2011/7/8 1:09:00 Author:Seven | Keyword: alarm circuit, time delay function | From:SeekIC

The system in figure (a) has five signal lines which deliver signals with sensors of S1~S5 respectively, when the sensors get signals, the relative thyristors are conducting, the indicators are glowing, the relay coil is getting through, by pressing the key of reset , the monitoring devices are working again. Two of the relay lines are controlled by the circuit in Figure (b). When the timer IS1of the integrated circuit, the output terminal is in a low LEV quickly, but it will return to the low LEV in the time of t1≈1.1R1C1.



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