Automobile burglar alarm and arming circuit for same

Details Automobile burglar alarm and arming circuit for same Automobile burglar alarm and arming circuit for same

1982-01-18

1984-10-23

Crosland, Donnie L.

Communications: electrical

Selective

Having indication or alarm

340 64, 340 52R, 307 10AT, B60R 2500

Patent

active

044791100

ABSTRACT:
A vehicle burglar alarm characterized by an arming circuit including a transition detector coupled to a door switch, and a divide-by-two and latching coupled to the transition detector; and a timing circuit responsive to the output of the arming circuit. The transition detector is polarity independent and develops a positive pulse for either a negative going or positive going transition at its input. The divide-by-two and latching preferably includes a first astable multivibrator which develops a negative going output signal after two transition signal pulses are received from the transition detector, and a second astable multivibrator responsive to the negative going output signal of the first multivibrator and operative to enable the timing circuit and simultaneously latch the first multivibrator. Thus, the timing circuit is enabled only after the vehicle's door is opened and then subsequently closed.

REFERENCES:
patent: 4123745 (1978-10-01), Gurgone
patent: 4136334 (1979-01-01), Seifers
patent: 4159466 (1979-06-01), Mensel
patent: 4188621 (1980-02-01), Heckelman et al.

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