http://forum.arduino.cc/index.php?topic=164643.msg1229078#msg1229078
buy 8 ICs and be happy This is for sure much more accurate than all the OPAmps circuits.
http://forum.arduino.cc/index.php?topic=164643.msg1229078#msg1229078
buy 8 ICs and be happy This is for sure much more accurate than all the OPAmps circuits.