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图1所示电路是一只4信道视频信号多路转换器,来自PC并联打印机口的8位二进制数据(只使用3位)控制了这种多路转换的运作。所有信道的输入信号为±2.5V,信道0为基准信道,你可以设定-2.5～+2.5V范围内的任何大小的
The circuit shown in Figure 1 is a 4-channel video multiplexer that controls the operation of this multiplexed 8-bit binary data (using only 3 bits) from a PC parallel printer port. The input signal for all channels is ± 2.5V, channel 0 is the reference channel, and you can set any size in the range of -2.5 ~ + 2.5V