Quote Originally Posted by tamersoss
It didn't help ... The flactuation is the same ... I only want tell you that i made a mdification on the schematic which is that i replced the 70 k by a 100 k resistor

Have you tried using a bit of software averaging? Read the input a bunch of times, sum the total of the reads, divide by the number of reads, use that number. I know it's not a perfect solution, but it's always worked for me (read that as I'm compensating for bad circuit design )
JDG