| 摘要 |
Compressor for use with an audio amplifier, and of the type wherein a junction FET connected to the input of an amplifying means, has its control terminal connected (a) to the output of said amplifying means through a control transistor, and (b) to either a reference voltage lead through a first resistor, or the input of said amplifying means through another resistor. With such an arrangement the control action of said junction FET is automatically adjusted and adapted to the operating range of output signals of said amplifying means, without the need of separate trimming means. According to a further aspect of the invention a compressor of the above type and comprising a second transistor having its emitter-collector path included in a circuit between said first transistor and the output of said amplifying means, can be made to operate on sinusoidal and square-wave input signals as well without creating overload conditions in the load impedance, by connecting a relatively large resistor in parallel to said circuit wherein said emitter-collector path of said second transistor is included.
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