| 摘要 |
PURPOSE:To prevent a power amplifier and a power circuit from rising in temperature abnormally by adding one capacitor which is used for two channels in common to the common ground terminal of voice coils of a right and a left speaker. CONSTITUTION:The capacitor 9 is connected between the common ground terminal of the speakers 7 and 8 and the ground. Thus, the capacitor 9 is added and then even if coupling capacitors 5 and 6 or the capacitor 9 short-circuits, a DC current flows to neither the speakers 7 nor 8 and power amplifiers 3 and 4 never heat up. Namely, the common ground terminal of the voice coils of the right and left speakers is grounded through the capacitor, so even no DC current flows to the speaker even in case of trouble in the short-circuit mode of the coupling capacitors and grounding capacitor, so that the power amplifiers and power source are prevented from heating up. |
