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59 minutes ago, TomXP411 said:

A max232 based shifter with pre-soldered DE9 is like $3 on Amazon...

Aren't economies of scale great? That's lower than the Q25 Mouser price of a 10ns PDIP MAX232's.

With +/-12V available, as simple transistor based circuit would still be cheaper, but that's cheap enough it's not going to be noticeable.

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