Security alarm apparatus

Details Security alarm apparatus Security alarm apparatus

G - Physics

08

B

340/124.1

G08B 13/00 (2006.01) G08B 13/22 (2006.01)

Patent

CA 1233538

ABSTRACT OF THE DISCLOSURE A security alarm apparatus which informs that someone trespassed by opening a door during the resident's absence. This apparatus comprises a sequential circuit which is enabled by mode selec- tion by the resident at his going out, and the sequen- tial circuit which stores the door opening and clos- ing produces an output signal upon second door opening, and the timer circuit is operated by the output signal of the sequential circuit and at the time-up to generate alarms. The sequential circuit can be cleared or disabled when the resident comes home and production of an alarm is then prevented.

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