I need a simple DC amplifier with
gain = 10
input voltage = 1 to 250 mV.
I have tested opamp LM358, but only one of my 3 pieces has linear relation between input voltage and gain.
Detail description is on http://www.mp222.wz.cz/opamp.html
I need 3 amplifiers. Shall I buy 100 chips and select 3 of them?