Alarm system

Details Alarm system Alarm system

1983-07-11

1986-04-29

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

340 63, 340508, 340511, 340537, 340546, 307 10AT, G08B 2300, G08B 1308

Patent

active

045860289

ABSTRACT:
Alarm system providing a signal by turning on alarms, lights, sirens, automobile horns or wake-up signal based on interruption of a monitor loop. Monitor loop includes a resistor which connects to the inputs of a low-power low-offset voltage dual comparator for providing an ON signal for turning on a buzzer alarm and also for driving a relay through a switching transistor. The relay can include normally closed and normally open contacts for operating an existing closed loop or open loop device or circuits. The alarm system also includes a line-adjust circuit for adjusting the particular resistance and the monitor loop, a latch circuit for latching the buzzer and relay in an ON position based on circuit interruption, and includes internal power source as well as provision for external power.

REFERENCES:
patent: 3786501 (1974-01-01), Marnerakis
patent: 4203095 (1980-05-01), Wilson, Jr.
patent: 4282517 (1981-08-01), Wilson, Jr. et al.
patent: 4348661 (1982-09-01), Lucchesi
patent: 4369436 (1983-01-01), Lautzenheiser

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