Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1992-11-13
1995-01-17
Peng, John K.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
3404255, 340502, 307 102, B60R 2500
Patent
active
053829417
ABSTRACT:
A vehicle alarm set signal level control that controls the volume of a car alarm and also the output level of the alarm setting or arming signal. The alarm volume is controlled by a frequency responsive circuit employing a silicon control rectifier in combination with a zener diode and a resistance that can be left in or removed from the circuit. Arming signal level control is comprised of a bypass circuit employing a transistor and a photo detector in combination with a potentiometer. The level of the output signal when setting the alarm is varied according to the amount of light available. In an optional embodiment for a car alarm using a low level signal both an arming signal setting signal level control and a visible output are used. The circuit employs a pulse rate controller providing an output through a protection circuit and a volume control to a piezoelectric tone generator. The output level of the pulse rate controller is controlled by a resistance that can be left in or removed from the circuit or alternatively through a potentiometer. The arming signal level control is provided by a photo detector in series with a plurality of resistances limiting the current to the piezoelectric tone generator. A visible signal is provided by a light emitting diode positioned at some easily visible location in a vehicle receiving an output from a LED output device.
REFERENCES:
patent: 4800361 (1989-01-01), Greif
patent: 4866417 (1989-09-01), Defino et al.
patent: 4885572 (1989-12-01), Iwata et al.
patent: 4996515 (1991-02-01), Schaffer et al.
Accele Electronics
Lefkowitz Edward
O'Reilly David
Peng John K.
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