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, than the mere use of power amplifier chip, sound, loudness obviously improved. Information before the amplifier circuit to produce schematics introduction of printed circuit board diagram, component layout