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Does anyone know what the approximate peak to peak voltage should be when you measure the output of a digital full scale sin wave (say 1kHz) from the headphone output of an iphone (4s or newer) into a large load (1Mohm or more)? Does the signal have a DC bias or is it centered about 0V? I would measure it on my iphone but I do not currently have an oscilloscope and haven't been able to find any information about the output levels online.