Audio amplifier turn-off control circuit

Amplifiers – Combined with automatic amplifier disabling switch means

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Details

381120, H03F 114

Patent

active

054205352

ABSTRACT:
A circuit comprising a transistor which, when supply is turned off, locks the output of the audio amplifier to the supply line, the potential of which is reduced gradually by a filter capacitor, so that the output voltage follows the supply voltage with the same slope, and is so controlled by the filter capacitor, thus eliminating undesired noise ("popping") at the output caused by electric transients in the audio amplifier.

REFERENCES:
patent: 3840820 (1974-10-01), Kawada
patent: 4181895 (1980-01-01), Yoshida
patent: 4371841 (1983-01-01), Eckert
patent: 4788508 (1988-11-01), Kawai
patent: 5199079 (1993-03-01), Anderson
patent: 5255094 (1993-10-01), Yong

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