Buzzer with Zener diode in discharge path

Details Buzzer with Zener diode in discharge path Buzzer with Zener diode in discharge path

1999-03-12

2000-08-29

Wu, Daniel J.

Communications: electrical

Audible indication

340384E, 340384R, 361160, 381104, 324145, 84 124, M01M 3704

Patent

active

061114979

ABSTRACT:
A relatively high voltage is developed across a buzzer by placing a resistance in the discharge path of an buzzer, e.g., by shunting one or more Zener diodes or LEDs across a switching transistor, the switching transistor being connected in series with the buzzer between a voltage potential and ground. Alternatively, the buzzer is shunted with a resistive element, with or without series connected a reversed biased diode. The result is a higher audio output without a corresponding increase in power consumption.

REFERENCES:
patent: 4163223 (1979-07-01), Sato et al.
patent: 4183278 (1980-01-01), Rea et al.
patent: 4797932 (1989-01-01), Rohulich et al.
patent: 5293149 (1994-03-01), Wilson et al.
patent: 5481185 (1996-01-01), Lane et al.
patent: 5596477 (1997-01-01), Horton
S.M. Sze, "Semiconductor Devices: Physics and Technology", John Wiley & Sons, Apr. 1985, pp. 83-84, 89, 98, 507-508, 512.

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