Audio amplifier on-off control circuit

Details Audio amplifier on-off control circuit Audio amplifier on-off control circuit

1993-05-21

1994-11-08

Sikes, William L.

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330 51, 381120, 381121, 381122, 381123, H03F 126, H03F 130, H03G 334

Patent

active

053630629

ABSTRACT:
A circuit for controlling on-off switching of an audio amplifier in such a manner as to prevent sharp uncontrolled variations of the output during switching from resulting in undesired noise (popping) on the loudspeakers. For so doing, the circuit provides for generating a controlled positive potential at the negative input in relation to the positive input of the amplifier when this is switched on or off. More specifically, when switching on, the potential difference is maintained pending switching of all the sources on the amplifier, after which, it is gradually eliminated for enabling the output to reach the steady-state value slowly and in controlled manner; whereas, when switching off, the potential difference is generated gradually for enabling the output of the amplifier to be grounded slowly prior to turning off the amplifier itself.

REFERENCES:
patent: 4638507 (1987-01-01), Palara et al.

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