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PCM1794设计疑问请教!

Other Parts Discussed in Thread: NE5534, PCM1794, PCM1794A
主要有以下问题:
1,原理图中两个箭头位置正常应该是什么波形?半周还是完整正玄波?
2,PCM1794的21,22脚电容,如果极性反装,I/V运放输出是完整正玄波,但是低通滤波器输出的两个声道波形电压不等,而且不确定那个声道电压会高。
3,PCM1794的21,22脚电容,如果极性正装,I/V运放输出是半周正玄波,但是低通滤波器输出的两个声道波形电压相等,但是听声音感觉总是哪里不对,尤其是低频的时候。
附图为原理图,半周正玄波图,正玄波图,反装电容时两个声道输出的电压差图。
备注:运放电源是正负5V