| 摘要 |
PROBLEM TO BE SOLVED: To enable a user to finely adjust sound volume and to sufficiently secure a minimum level point by lowering sensitivity in a large sound volume area of an electronic sound volume. SOLUTION: The user is enabled to finely adjust the sound volume and the minimum level point is sufficiently secured by lowering the sensitivity in the large sound volume area since an electronic volume circuit is constituted so that the state of an output signal of a differential amplifier circuit 15 is switched stepwise by providing first and second transistors TR1, TR2.
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