Audio amplifier

Details Audio amplifier Audio amplifier

1980-10-17

1983-01-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

330 51, 330112, 330207P, 330291, H02H 720

Patent

active

043694128

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 circuiting a check signal 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 muting the output of the amplifier if the voltage at the auxiliary terminal exceed a predetermined value.

REFERENCES:
patent: 3838352 (1974-09-01), Dolby et al.

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