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引用第43楼karajanlee于2013-03-22 19:09发表的 :
前面那个LED不能随便换的。。第二级耦合还用电解。。。。。那两个220uF的电容要用低等效串联电阻的才好,FW是不行的,怎么也换FM吧。输出运放换成5532不知道效果怎么样,呵呵。。我很想知道测试结果和原版比有什么区别。。
NJM2068/NE5532: If you’re mainly going to run the O2 from battery I strongly recommend the NJM2068 as it reduces the overall idle power consumption about 13% significantly helping battery life. At 2.5X or 3X gain there’s no difference in distortion performance between the NJM2068 and any other op amp I tried and it’s generally quieter. But, at the 6.5X gain setting, you can get a slight reduction in high frequency distortion from about 0.0018% to 0.0010% switching to the NE5532. Anything below 0.01% is very likely inaudible and both are well under that threshold. But the NE5532 is 3 dB noisier and shortens battery life. Anything more expensive than the NJM5532 is not only a waste of money but some very fast op amps may have stability problems, require different compensation, etc. See the Op Amp Measurements article.
原作者对于2068/5532的看法... |
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