巴赫曼背板BS212

1）输入、输出信号的关系见图5的a电路，为二进一出模式。

2）电路传输的是数字信号，即0和1，若为+5V供电，电路的静态或即时电平，非5V即0V。

虽然为差分模式，但不宜用模拟电路的差分放大器来等效了——因为传输的仍为数字电平信号。 这里我只能用异或门电路来勉为等效了——其弃同认异的风格，恰恰也符合了电路信号处理的规则。

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