Audio power amplifier

Details Audio power amplifier Audio power amplifier

1987-03-10

1988-05-10

Laroche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including class d amplifier

330264, H03F 3217

Patent

active

047438606

ABSTRACT:
A power amplifier circuit described herein is utilized as an audio output driver circuit for a currency-operated phonograph player. First and second series capacitors have a junction therebetween and are coupled across a floating, double-ended power supply. A speaker is coupled between the junction and ground. First and second complementary conductivity power MOSFETs are connected between a first power supply output and ground and between a second power supply output and ground, respectively. The MOSFETs are driven by an amplified audio input signal and alternately connect one or the other power supply outputs to ground to alternately charge and discharge the capacitors causing alternating current to flow through the speaker.

REFERENCES:
patent: 4464634 (1984-08-01), Velazquez
patent: 4483016 (1984-11-01), Hochstein et al.
patent: 4531096 (1985-07-01), Yokoyama

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