大部分放音机存在着背景电流声大的弊病,听起来很不舒服。背景电流声来源主要是电动机在转动过程中电刷和换向器接触转换产生的电气噪声,通过电源电路窜到其他放大电路形成的。如能加上一LC滤波电路,就能很好地抑制这种干扰,起到消除噪声的作 Most radios have the drawback of loud background currents and sound uncomfortable. Background The main source of current noise is the electric noise generated by the contact between the brush and the commutator during the rotation of the motor, which is generated by the power circuit going to other amplifying circuits. If you can add a LC filter circuit, you can suppress this interference, play to eliminate noise for