VOLUME CIRCUIT WITHOUT MECHANICAL DRIVE PART LINEARLY HEARD ON AUDIBILITY

摘要

PROBLEM TO BE SOLVED: To exclude a mechanical drive part from a part where a sound volume of an audio amplifier, formed an A curve capable of hearing linearly an output on audibility by entering a circuit changing an output voltage of a signal into a signal transfer system and not entering a noise to the signal as much as possible.;SOLUTION: In the present invention, an operational amplifier is used for controlling an output voltage of a sound volume to be continuously changed. A capacitor is used for an input part, and a voltage of the capacitor is charged and discharged. Thus, the operational amplifier can surely output the voltage, and thereby play a role of a volume function by controlling the output voltage of an analog signal in precisely. By not entering a circuit for controlling the output voltage of the analog signal to a signal transfer system, and not entering a noise into the signal as much as possible, a circuit is constructed so as to become an A curve hearing linearly the output on audibility.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2018,JPO&INPIT