Communications: electrical – Selective – Having indication or alarm
Patent
1976-06-21
1977-04-05
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
307 10AT, B60R 2510
Patent
active
040165370
ABSTRACT:
The present invention is an alarm triggering circuit for use in an alarm system for a motor vehicle having an alarm, a power source and an ignition system that provides a positive voltage when it is turned on and a ground when it is turned off. The alarm triggering circuit includes an alarm setting circuit which sets the alarm triggering circuit and a delaying circuit which enables an operator of the mot or vehicle to exit it. The setting circuit includes a first timer chip whose output is normally positive and a first transistor which when it is turned on provides a ground to the input terminal of the first timer chip. When the ignition system is turned off, the first transistor is turned off thereby causing the output of the first timer chip to go to ground. The delaying circuit includes a capacitor in series with a variable resistor and is electrically coupled to the alarm triggering circuit which includes a second timer chip whose ground terminal is electrically coupled to the output terminal of the first timer chip and a second transistor whose base is electrically coupled to the output terminal of the second transistor and which is electrically coupled to the alarm so that when it is turned on by the output of the second timer chip the alarm will sound.
REFERENCES:
patent: 3829829 (1974-08-01), Teich
patent: 3866168 (1975-02-01), McGuirk, Jr.
patent: 3930226 (1975-12-01), Plumberg
patent: 3956732 (1976-05-01), Teich
Johansen W. Edward
Waring Alvin H.
LandOfFree
Alarm triggering circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alarm triggering circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alarm triggering circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2269894