Alarm driving signal generator

Details Alarm driving signal generator Alarm driving signal generator

1987-07-17

1988-12-20

Orsino, Joseph A.

Communications: electrical

Audible indication

Ultrasonic pest control

310317, 340692, G08B 300

Patent

active

047927895

ABSTRACT:
To activate a buzzer of voltage driven type in response to an alarm signal, the alarm driving signal generator comprises a capacitor connected between a supply voltage and the buzzer; a first transistor for intermittently discharging the capacitor in response to the alarm signal; and a second transistor for intermittently charging the capacitor in accordance with a time constant in response to a clock signal higher than the alarm signal in frequency, after the capacitor has once been discharged. The alarm buzzer can be actuated on the basis of the intermittently charged capacitor voltage. The above generator is simple in circuit configuration as compared with the conventional circuit.

REFERENCES:
patent: 3585405 (1971-06-01), Stettiner

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