Power amplifier circuit for audio signal and audio device using

Details Power amplifier circuit for audio signal and audio device using Power amplifier circuit for audio signal and audio device using

1994-02-22

1995-09-12

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330295, 330297, H03F 330, H03F 368

Patent

active

054500362

ABSTRACT:
The present invention includes an amplifier for amplifying an audio signal, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the amplifier and a control circuit for controlling a switching period of the switching circuit such that the power feeding the amplifier correspondingly to a difference in voltage between the feeding power and one of the voltage of the audio signal and the voltage of the audio signal amplified by the amplifier is changed correspondingly to a level of the audio signal.

REFERENCES:
patent: 4218660 (1980-08-01), Carver
patent: 4472687 (1984-09-01), Kashiwagi et al.
patent: 4507619 (1985-03-01), Dijkstra et al.
patent: 5200711 (1993-04-01), Anderson et al.

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