Amplifier circuitry

Details Amplifier circuitry Amplifier circuitry

2005-12-27

2005-12-27

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including protection means

C330S20700P

Reexamination Certificate

active

06980058

ABSTRACT:
Input signal amplified by an input amplifier is delivered via a voltage limiter circuit to a power amplifier, and a speaker is driven by the signal amplifier by the power amplifier. Voltage produced across a resistor, which is proportional to an output current flowing to the speaker is detected by a current detecting amplifier, and the amplitude of the signal to be inputted to the power amplifier is controlled in accordance with the current value detected by the current detecting amplifier. Thus, the maximum output power can be controlled irrespective of impedance of the speaker. By also controlling the voltage limiter circuit in accordance with an instantaneous value of the output current, the continuous maximum output value and instantaneous maximum output value can be controlled independently of each other.

REFERENCES:
patent: 4370622 (1983-01-01), Hornbeck et al.

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