| 摘要 |
PROBLEM TO BE SOLVED: To reduce the capacity of a large capacity capacitor interposed between an amplifier and an output connector in an audio amplifier to which a plurality of kinds of audio apparatuses are connectable through one output connector. SOLUTION: This device is provided with an amplifier 15, an output connector 23, a capacitor 17, an impedance discriminating means 33 for judging whether or not the impedance of an external load connected to the output connector 23 is not more than a prescribed value, a switch 19 for short-circuiting the both edges of the capacitor 17 when the impedance of the external load is not more than the prescribed value, and means (29, 31) for applying a DC bias voltage to the return side of the output connector 23 when the impedance of the external load is not more than the prescribed value. COPYRIGHT: (C)2004,JPO
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