Audio-frequency signal level control circuit专利检索-源极跟随器放大器电子零件及设备专利检索查询-专利查询网

Audio-frequency signal level control circuit

阅读：986发布：2023-05-20

专利汇可以提供Audio-frequency signal level control circuit专利检索，专利查询，专利分析的服务。并且In an audio signal level control circuit for use in an audio system such as an electronic musical instrument, which comprises an emitter-grounded type transistor amplifier, an input signal being applied to the base and an output signal being taken out from the collector, a constant-current supply circuit including another transistor and being connected in series in the emitter path of the amplifier, and a field effect transistor (FET) connected between the emitter of the amplifier and the ground from an AC viewpoint as a variable resistance element whose resistance value is controlled by a level control voltage applied to the gate of the FET; the improvement comprises a unidirectional amplifying circuit such as an emitter follower type transistor amplifier, the base of which being connected to the non-grounded side of the FET and the emitter being connected to the gate of the FET to provide a negative feedback function of the FET operation, thereby reducing the distortion in the output signal of the first-mentioned amplifier and eliminating the generation of noises due to rough variation of the control voltage.，下面是Audio-frequency signal level control circuit专利的具体信息内容。

权利要求

1. An audio-frequency signal level control circuit comprising: amplifier means including therein at least one first active element, said element having two electrodes connected respectively to audio-frequency signal input and output terminals and a third electrode, a constant-current supply circuit including a second active element connected with said first active element at said third electrode thereof, a voltage-controlled variable impedance FET element including a grounded source end and drain end connected to the juncture between said third electrode and said second active element and a voltage-controlled gage electrode for varying the quantity of negative feedback for the first active element of said amplifier means, a unidirectional amplifier circuit having its input side connected to said juncture between said third electrode and said second active element and a series connected resistor and capacitor coupling the output side of said unidirectional amplifier to said control electrode.

2. The level control circuit according to claim 1, in which said first and said second active elements are transistors.

3. The level control circuit according to claim 1, comprising: a variable DC voltage means connected through a resistor to the voltage-controlled electrode.

4. The level control circuit according to claim 1, in which said unidirectional amplifier circuit is constituted by an emitter-follower transistor amplifier circuit.

5. The level control circuit according to claim 4, in which a transistor constituting said emitter-follower circuit has a base connected to the said juncture between said first and second active elements, a collector grounded, and an emitter connected through a resistor of low resistance to a power source, said emitter being connected to said control electrode through the series-connected capacitor and resistor.

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Audio-frequency signal level control circuit

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