Line to phonolevel filter back to projects

Sometimes an old amplifier has a Phono input, in case you do want to connect a non-phono level in put to this input you can use above schematic. Connect the 2.5 mV output to the amplifier 'phono' input and the 500mV input to regular audiosources. The circuit corrects for the RIAA curve applied to recordings on vinyl and input level.