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Still here, but not for long :-)
Just got an idea and would like an opinion (Ale maybe) :
What if I used an offset instead of a resistor divider ? Practically, I'd replace the 18K resistor by a few diodes in series to get, say, 2.5 V drop, transforming the 12V/3V levels into 9V/0.5V which would be much more immune to noise than the values I have now 4V/0.75V, wouldn't it ?
Well, input impedance would be divided by 4 but I don't think it's a problem...
Any comment is welcome.
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