This article uses two transistors instead of MAX232 to complete the production of data lines. The production cost is lower than using MAX232...
OK, now I will give you the internal circuit of MAX232 and the circuit diagram of 6688 data line made by transistors, for reference for those who are like me and cannot buy data line or MAX232 in remote mountainous areas.
The above is the internal circuit diagram of MAX232
The following is a circuit diagram of the 6688 data line that I made using a transistor instead of a MAX232. The C7 capacitor generates a negative voltage:
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