巴赫曼背板BS212
1）輸入、輸出信號的關系見圖5的a電路，為二進一出模式。
2）電路傳輸的是數字信號，即0和1，若為+5V供電，電路的靜態或即時電平，非5V即0V。
雖然為差分模式，但不宜用模擬電路的差分放大器來等效了——因為傳輸的仍為數字電平信號。 這里我只能用異或門電路來勉為等效了——其棄同認異的風格，恰恰也符合了電路信號處理的規則。
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