For the alarm described trigger inputs can be derived from existing courtesy light and/or ignition circuits and various alarm outputs are available to permit intermittent (car horn and/or lights) and continuous (siren or piezoelectric transducer) operation. Furthermore, an output is available for disabling the vehicle's ignition system. No external 'keyswitch' is required and appropriate delay times are incorporated which permit exit and entry to and from the vehicle without sounding the alarm. The circuit is based on the 555 timer IC. Four such devices are used, three connected in monostable and one in the astable mode. The three monostable timers are used to provide the required delay times.
Versatile car alarm...
Vielseitiges Kfz-Alarmsystem
Practical Electronics ; 18 , 7 ; 62-67
1982
6 Seiten
Aufsatz (Zeitschrift)
Englisch
Versatile alarm system for HART can be programmed in the field
British Library Online Contents | 1997
ALARM DEVICE, ALARM SYSTEM, ALARM METHOD AND ALARM CONTROL PROGRAM
Europäisches Patentamt | 2018
|Alarm integrated circuit, alarm system and alarm method
Europäisches Patentamt | 2022
|Vehicle Alarm System, Alarm Device and Alarm Method Thereof
Europäisches Patentamt | 2019
|