The datasheet for the LM358 says that its output low is typically 0.005V or a max of 0.02V when it has a 10k load resistor from the output to ground. A load resistor does not affect the gain unless it is a low value which is like a short circuit. The feedback resistors determine the gain.Audioguru - when you say
do you mean a 10K resistor from the LM358 output to ground? I don't have one of those in my circuit - would this not reduce my gain from the circuit considerably?
Your feedback resistor is pulling the output up. Then a 10k load resistor to ground will not make much difference.Roff - the 0.63V limit is with the 10K resistor (limit with the 100K is 0.09V)
Try it with a negative supply that is 1V or more.
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