Speaker driver

Details Speaker driver Speaker driver

1991-04-26

1992-09-29

Ng, Jin F.

Communications: electrical

Audible indication

Ultrasonic pest control

3403111, 34082544, H04B 116

Patent

active

051516802

ABSTRACT:
A speaker driver is operated by a battery and drives a speaker to generate an alert tone in response to an externally input intermittent signal. The speaker driver includes a reference voltage generator for generating a reference voltage, a transconductance amplifier for outputting a current corresponding to a differential voltage between a voltage of the battery and the reference voltage, an output control switch for ON/OFF-controlling the output current from the transconductance amplifier in accordance with the intermittent signal, and a DC amplifier for amplifying the ON/OFF-controlled output current as a driving current for the speaker. Since a speaker driving current is decreased as a power source voltage is dropped, an abnormal voltage drop during an alert generation period can be prevented, thereby prolonging the service life of a battery.

REFERENCES:
patent: 4054869 (1977-10-01), Smith et al.
patent: 4183020 (1980-01-01), Schade, Jr.
patent: 4210855 (1980-07-01), Harer et al.
patent: 4308609 (1981-12-01), Tamaki
patent: 4755816 (1985-07-01), DeLuca

Affiliated with

Also associated with

Rating

Speaker driver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Speaker driver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Speaker driver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1971238