| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a negative feedback amplifier for driving a loudspeaker, capable of suppressing a distortion generated by a resistor constituting a negative feedback circuit of the negative feedback amplifier for improvement of sound quality.SOLUTION: In a circuit forming a negative feedback from an output of a negative feedback amplifier for driving a loudspeaker, a loudspeaker and a negative feedback resistor connected therewith in series, the negative feedback resistor connected in series is sealed into vacuum or gas, a bias voltage with a different polarity is applied thereto for heat generation, which is taken as a negative feedback resistor.</p> |
