Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1974-06-05
1976-06-08
Goldberg, Gerald
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
317 36TD, 330207P, H02H 320, H02H 720
Patent
active
039626075
ABSTRACT:
A protective circuit for a loudspeaker connected to the output of an audio amplifier, in which a predetermined fraction of the voltage derived from the output of the power amplifier is peak rectified and stored in an accumulator provided with resistors for leaking charge from the accumulator at a predetermined rate. The voltage across the storage capacitor is normally maintained blocked in respect to application to a diode control circuit for by-passing input signal to the power amplifier. When the voltage across the storage capacitor attains a sufficiently high value, control signal is applied to oppositely poled diodes, to vary their back biases, and the diodes provide a controlled shunt path to ground for peaks of the signal applied to the input to the power amplifier.
REFERENCES:
patent: 3204124 (1965-08-01), Durio, Jr.
patent: 3564338 (1971-02-01), Teshirogi et al.
patent: 3609407 (1971-09-01), Garuts
patent: 3634871 (1972-01-01), Siedband et al.
patent: 3818274 (1974-06-01), Dewitte et al.
Dynaco Inc.
Goldberg Gerald
Salce Patrick R.
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