| 摘要 |
PURPOSE: To provide a plurality of output power supply circuit capable of restricting click noise by coinciding rising and trailing characteristics of plural reference voltages. CONSTITUTION: A control circuit 10 comprises a power supply switch 11, power supply unit 12, a zener diode D1 connected to the first output taken out from the power supply unit 12, resistor R1, capacitor C1, switching means FETQ1, capacitor C3, and variable resistor RVI. Also as a third output, a zener diode D2, resistor R2, switching means FETQ2, capacitor C2, variable resistor RV2 and a fourth output and a fifth output and others are provided. By doing this, the rising and trailing characteristics of the power supply voltage are made symmetrical by the control circuit, and the occurrence of click noise can be suppressed and a conventionally required muting device can be omitted. |
