Audio power amplifier with noise prevention at turn-on and turn-

Details Audio power amplifier with noise prevention at turn-on and turn- Audio power amplifier with noise prevention at turn-on and turn-

1992-07-14

1994-04-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330149, H03F 126

Patent

active

053070259

ABSTRACT:
An audio power amplifier is provided that includes circuitry to prevent popping noises when the amplifier is turned on and turned off. The amplifier can be powered with a single-ended voltage power supply, and thus may be used within systems such as personal computer. The amplifier includes a control circuit that prevents the fast charging of the output AC coupling capacitor when the amplifier is turned on and turned off. The control circuit controls a driver stage such that the output transistors turn on slowly when power is first applied, and such that the output transistors turn off quickly when the supply voltage is removed.

REFERENCES:
patent: 3889202 (1975-06-01), Suzuki
patent: 4015215 (1977-03-01), Seki

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