| 摘要 |
PURPOSE:To display the level of the frequency component of a sound signal and the level of a source voltage on one display device by providing a diode between one display body for displaying the level of the frequency component and another display body. CONSTITUTION:When switches S1 and S2 are on, display bodies 3-7 composed of LEDs D1-D25 for level display are applied with a voltage VCC and the sound signal applied to an input terminal 1 is amplified by driving circuit 8-12 and displayed on the LEDs D1-D25. When the switches S1 and S2 are off, the source voltage VCC is applied to only the LEDs D21-D25 and the source voltage VCC is applied to the driving circuit 12, so the LEDs D21-D25 display the level of the source voltage.
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