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bg4rgc:LM358是运放,跟比较器还是有些区别的,音频输出并没有完全切断,W3把音量调最高时候,低噪被后级放大,沙沙声就出来了自激问题多半跟PCB走线有关,想彻底解决静噪电路问题,最好重新设计静噪电路 (2021-10-01 10:38)
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