What are the voltage level (pk to pk, both average and the maximum voltage output) of a music player from Samsung mobile phones, Apple iPods, iPhones etc. I dont have a multimeter here and those devices above. I cannot find on the internet the device specifications that list those voltage levels. Ill be designing an audio preamplifier and so we need these data to aid in dc biasing calculations.
If have oscilloscope, that would be better and a graph for it