Amplifiers – Combined with automatic amplifier disabling switch means
Reexamination Certificate
2008-08-07
2010-02-16
Pascal, Robert (Department: 2817)
Amplifiers
Combined with automatic amplifier disabling switch means
C381S094500
Reexamination Certificate
active
07663433
ABSTRACT:
An audio amplifier is provided. The audio amplifier includes an amplifier, a biasing circuit, and a time-delay circuit. The amplifier circuit is for amplifying audio signals. The biasing circuit is for providing a bias voltage to the amplifier circuit to actuate the amplifier circuit. The time-delay circuit is for receiving a pulse signal and delaying the bias voltage to avoid a sudden actuation of the amplifier circuit based on the pulse signal. The time-delay circuit comprises a first input for receiving the pulse signal, a first resistor coupled to the first input, a first output coupled to the biasing circuit, a first BJT whose base, emitter, collector are respectively coupled to the first resistor, ground, and the first output.
REFERENCES:
patent: 5081426 (1992-01-01), Imanishi
patent: 6573787 (2003-06-01), Ikin
Chen Wen-Ming
Duan Wang-Chang
Hung Chun-Lung
Liu Jie
Wang Tao
Hon Hai Precision Industry Co. Ltd.
Hong Fu Jin Precision Industry ( ShenZhen) Co., Ltd.
Nguyen Hieu P
Niranjan Frank R.
Pascal Robert
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