| 摘要 |
PURPOSE:To reduce unnecessary radiation level by connecting a capacitor and a resistor of parallel arrangement between a reference voltage point of the secondary side and a reference voltage point of the primary side of a DC/DC converter using as a power source a battery. CONSTITUTION:A line filter 2 is connected to a battery 1, and a DC/DC converter is connected to the filter 2. A capacitor 14 and a resistor 14 of parallel arrangement are connected between the reference voltage points of the secondary and primary sides of this converter. Thus, alternating impedances of the primary and secondary sides decrease, a noise generated by a resistor 13 decreases, and unnecessary external radiation is not produced through a cord or the like of a speaker 12. |
