Buzzer driving device

Details Buzzer driving device Buzzer driving device

1995-06-30

2000-10-24

Wong, Peter S.

Electricity: battery or capacitor charging or discharging

Battery or cell charging

Time control

3404571, 327205, H02J 716, B60Q 100, H03K 312

Patent

active

061372706

ABSTRACT:
To prevent an erroneous operation of a buzzer upon fall of a source voltage, a buzzer driving device connectable with a direct current source (1) comprises a charging/discharging circuit (3) which is connected with the direct-current source (1) via a switch (2) and performs the charging and discharging at a predetermined time constant (CR) when the switch (2) is turned on and off, respectively, a hysteresis circuit (25) to which an output voltage of the charging/discharging circuit (3) is input and which operates until the output voltage rises to or above an operation threshold value (V.sub.T) after the start of the charging of the charging/discharging circuit (3) and thereafter remains inoperative unless the output voltage falls to or below a stop threshold value (V.sub.S) which is smaller than the operation threshold value (V.sub.T) due to the discharging of the charging/discharging circuit (3), and a driving circuit (14) for outputting a drive signal for a buzzer (15) in response to the operation of the hysteresis circuit (25).

REFERENCES:
patent: 3965373 (1976-06-01), Carlson
patent: 4188549 (1980-02-01), Dorais
patent: 4246572 (1981-01-01), Larsen
patent: 4369381 (1983-01-01), Okamoto et al.
patent: 4803459 (1989-02-01), Ta

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