SIMPLE_BURGLAR_ALARM_1

Published:2009/7/9 21:41:00 Author:May | From:SeekIC

Using one IC and a driver transistor， this simple alarm uses either NO or NC sensors，When a sensoroperates，the input to U1A goes low，causmg U1A to go high，U1B low，and U1C high．This biases Q1 ONand activates relay K1．On/offis vla keyswitch S1．



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