Great work.
Is there anything special about the CA3140 Op-amp?
Would a MC74HC14A Schmitt trigger work for this too? (I think I have one)
My typical microcontroller circuits use a 0-5V ADC range, with 10-bit resolution.
If limited to 0-1V range, then the resolution would only be about 200 increments.
Hey, that's plenty! Who needs to measure wind speed in 0.1 kph increments, when it varies by 5 kph every minute anyway?
Thanks!