LATCHING_ALARM

Published:2009/6/30 2:38:00 Author:May | From:SeekIC

Closed-circuit alarm drawing only 130 μA of standby current from battery is turned on by opening sensor switch or outing wire. Automatic latching contacts on relay prevent burglar or intruder from deactivating alarm by resetting sensor switch, Relay is Radio Shack 275-004. Sensor can be foil strip around window subiect to breakage.-F. M. Mims, Transistor Projects, Vol. 3, Radio Shack, Fort Worth, TX, 1975, p 75-86.



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