I am feeding the non-inverting input of a single supply op amp (LM358) with signals from various sources.
At their output, some are AC coupled and some DC coupled, e.g. wholey positive or negative offset. The latter are LF so I cannot just insert a cap.
What is the best type of circuit to provide a volt or two of adjustment to the DC level of the input signal so that it matches the op amp?
I would prefer passive components if possible.
I have searched for circuits on the web, but most seem to be about shifting the op amp's output not input.
Mike Towner