Audio amplifier

Details Audio amplifier Audio amplifier

1980-11-19

1983-04-05

Rubinson, G. Z.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

179 1F, 330207P, 330298, H03F 138

Patent

active

043792090

ABSTRACT:
An audio amplifier having an auxiliary terminal for connection of a feedback line to the grounded terminal of a loudspeaker and including a circuit for protection against voltage overload on the amplifier and loudspeaker if the auxiliary terminal is inadvertently connected to the ungrounded terminal of the loudspeaker, or in case of malfunction of the feedback circuit. The protection circuit includes a signal generator activated by the closing of a power switch for producing a check signal for circuiting through the terminals of the loudspeaker to the auxiliary terminal and a controller sensitive to the voltage at the auxiliary terminal for controlling a switch for disconnecting the feedback line, if the voltage at the auxiliary terminal exceeds a predetermined value.

REFERENCES:
patent: 3484692 (1969-12-01), Lode
patent: 3838352 (1974-09-01), Dolby et al.
patent: 4236118 (1980-11-01), Turner

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