| 摘要 |
PURPOSE:To improve the output and the quality of sound of a power amplifier by producing a pair of DC voltages of different polarity and equal absolute value from the output terminals of a battery and a DC/DC converter. CONSTITUTION:The first electrode of a battery E is connected to a reference voltage, and the second electrode is connected through a fuse FS to the input terminal of a DC/DC converter 3. The converter 3 inverts the polarity of an input DC voltage. A negative feedback circuit NF is provided at the converter 3. An impedance circuit 5 having an impedance equal to the output impedance of the converter 3 is provided. The output terminals of the converter 3 and the circuit 5 are grounded through large capacity condensers C1, C2 having equal capacity. The first and second output terminals T1, T2 always produce DC voltage of equal absolute value and negative and positive polarities to a power amplifier 2. |
