Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1979-12-12
1982-05-18
Konick, Bernard
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330207P, 361 79, H02H 720, H02H 310
Patent
active
043306861
ABSTRACT:
This invention relates to a loudspeaker protection device which disconnects the drive unit, or units, of the loudspeaker from an amplifier when the voltage across, or the current through, the drive unit, or one of the drive units, exceeds a predetermined level. The protection device includes a bistable device comprising a complementary pair of transistors arranged to be changed from the reset state to the set state when the voltage on an input terminal exceeds a predetermined level. The transistors are arranged to be both non-conductive when the device is in the reset state and both conductive when the device is in the set state. When the transistors are conductive, the collector current of one of them flows through the coil of an electromagnetic relay having normally closed contacts in the output circuit of the amplifier. Signals indicating the voltage across, or the current through, the various drive coils are connected to the input terminal of the protection device through individual rectifiers so that different levels of protection can be arranged for the various frequency ranges.
REFERENCES:
patent: 3564338 (1971-02-01), Teshirogi et al.
patent: 3904979 (1975-09-01), Suzuki
patent: 3935513 (1976-01-01), Suzuki
patent: 3992678 (1976-11-01), Suzuki
patent: 3996497 (1976-12-01), Kamimura
patent: 4016460 (1977-04-01), Stadler
patent: 4057767 (1977-11-01), Laupman
patent: 4173739 (1979-11-01), Yoshida
patent: 4173740 (1979-11-01), Nagata et al.
patent: 4216517 (1980-08-01), Takahashi
Konick Bernard
Myers Randall P.
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