I am looking for suggestions or pointers to a simple circuit that boosts line-level audio, so that it is strong enough to use with the ADC peripheral on my MCU.
I am aware and have seen many that use an op amp, but I am looking for something cheaper (but still simple), that does not introduce any other artefacts except amplitude boost.
I believe line-level audio is centered at ground and has about a 1.6v swing, where as my ADC input requires a swing of 3.3v
EDIT: My preference is to get this done with a few resistors and capacitors, if that is possible??