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加装音频输入(POLO原装单碟CD机版)

      夜路周日约我帮他加装输入,他的是原装单碟CD机,拆开后发现电路与我的卡带机不一样，音频控制方式也有所不同，研究了半天，发现FM的音频解码是直接内置在控制IC TDA7641N内,原理大概是:TEA6843 FM收音处理器以数字形式通过58脚传送到TDA7641N的11脚,然后在TDA7641N内再进行解码,变成左右声道,所以通过FM加装的方法是行不通,只能用最后一种!


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     只能通过CD通道来加装了,经查对TDA7641N的5脚=CD IN R,7脚=CD IN L,6脚=CD GND,在电路板上切断原来从CD总成音频到 TDA7641N 5,6,7脚,从中用屏蔽线通到主机外

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     音频输入插座装在POLO中控面板上

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顺便帮他加了一个USB电源接口,让他的PDA导航时可以接电!

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如果按上面方法加装,CD机内一定要有CD碟,而且是播放状态,否则会自动跳回收音模式