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Hi,
74HC4052 or HCF4052 is used as a multiplexer for extending serial ports!!! the outputs of 4052 come to 232 ICs (ST232C, MAX232, MAX3232)! The schematic is here:
The output (green) and input (blue) of 232 ICs are shown in the picture below:
As it can be seen, the output is between -1...
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