用ＮＥ５５３２制作优质前放，用“运放之星”ＮＥ５５３２制作了一款前置放大电路加在功放输入端，比单纯的用功放芯片，音效、响度明显得到了改善。资料中有制作前放电路原理图介绍，印刷电路板图，元件布置图-Production of high-quality preamplifier with NE5532, use the "Star of the op amp" NE5532 produced a preamplifier circuit added to the amplifier input, t