| 摘要 |
PROBLEM TO BE SOLVED: To reproduce a low band without sacrificing it even at the time of reducing the capacity of an external capacitor. SOLUTION: This amplifier consists of an output terminal 13 of a power amplification circuit 11 provided in an IC 10, a resistance Ra connected between a terminal 14 of the IC 10 other than the output terminal 13 and the negative feedback input side of the power amplification circuit 11, a first capacitor Co inserted between the output terminal 13 and a speaker 2, and a second capacitor Ca inserted between the terminal 14 of the IC 10 and the wiring route from the output terminal 13 to the speaker 2, and the attenuation characteristic of the low band frequency consisting of the first capacitor Co and the impedance of the speaker 2 is corrected by the increase of the amplification characteristic of the low band frequency determined by the time constant of the second capacitor Ca and the resistance Ra. |
