The electric lock circuit of Guanghua burglarproof door bell

Published:2011/7/6 10:01:00 Author:qqtang | Keyword: electric lock, door bell | From:SeekIC

See as the figure, the circuit consists of the door control magnetic switch, the relay control circuit, ding-dong door bell sound making circuit, the simulated police car sound circuit and so on. It can be the door bell, or used as the burglarproof alarm of pry.



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